diff --git a/bolt/lib/Rewrite/RewriteInstance.cpp b/bolt/lib/Rewrite/RewriteInstance.cpp
diff --git a/bolt/test/X86/fragment-lite.s b/bolt/test/X86/fragment-lite.s
@@ -3,35 +3,42 @@
 # RUN: split-file %s %t
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %t/main.s -o %t.o
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %t/baz.s -o %t.baz.o
+# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %t/baz2.s -o %t.baz2.o
 # RUN: link_fdata %s %t.o %t.main.fdata
 # RUN: link_fdata %s %t.baz.o %t.baz.fdata
-# RUN: merge-fdata %t.main.fdata %t.baz.fdata > %t.fdata
-# RUN: %clang %cflags %t.o %t.baz.o -o %t.exe -Wl,-q
+# RUN: link_fdata %s %t.baz2.o %t.baz2.fdata
+# RUN: merge-fdata %t.main.fdata %t.baz.fdata %t.baz2.fdata > %t.fdata
+# RUN: %clang %cflags %t.o %t.baz.o %t.baz2.o -o %t.exe -Wl,-q
 # RUN: llvm-bolt %t.exe -o %t.out --lite=1 --data %t.fdata -v=1 -print-cfg \
 # RUN:   2>&1 | FileCheck %s
 
 # CHECK: BOLT-INFO: processing main.cold.1 as a sibling of non-ignored function
-# CHECK: BOLT-INFO: processing foo.cold.1/1 as a sibling of non-ignored function
-# CHECK: BOLT-INFO: processing bar.cold.1/1 as a sibling of non-ignored function
+# CHECK: BOLT-INFO: processing foo.cold.1/1(*2) as a sibling of non-ignored function
+# CHECK: BOLT-INFO: processing bar.cold.1/1(*2) as a sibling of non-ignored function
 # CHECK: BOLT-INFO: processing baz.cold.1 as a sibling of non-ignored function
-# CHECK: BOLT-INFO: processing baz.cold.1/1 as a sibling of non-ignored function
+# CHECK: BOLT-INFO: processing baz.cold.1/1(*2) as a sibling of non-ignored function
+# CHECK: BOLT-INFO: processing baz.cold.1/2(*2) as a sibling of non-ignored function
 
 # CHECK: Binary Function "main.cold.1" after building cfg
 # CHECK: Parent : main
 
-# CHECK: Binary Function "foo.cold.1/1" after building cfg
+# CHECK: Binary Function "foo.cold.1/1(*2)" after building cfg
 # CHECK: Parent : foo
 
-# CHECK: Binary Function "bar.cold.1/1" after building cfg
-# CHECK: Parent : bar/1
+# CHECK: Binary Function "bar.cold.1/1(*2)" after building cfg
+# CHECK: Parent : bar/1(*2)
 
 # CHECK: Binary Function "baz.cold.1" after building cfg
 # CHECK: Parent : baz{{$}}
 
-# CHECK: Binary Function "baz.cold.1/1" after building cfg
-# CHECK: Parent : baz/1
+# CHECK: Binary Function "baz.cold.1/1(*2)" after building cfg
+# CHECK: Parent : baz/1(*2)
+
+# CHECK: Binary Function "baz.cold.1/2(*2)" after building cfg
+# CHECK: Parent : baz/2(*2)
 
 #--- main.s
+.file "main.s"
   .globl main
   .type main, %function
 main:
@@ -126,6 +133,7 @@ baz.cold.1:
 .size baz.cold.1, .-baz.cold.1
 
 #--- baz.s
+.file "baz.s"
   .local baz
   .type baz, %function
 baz:
@@ -149,3 +157,29 @@ baz.cold.1:
   retq
   .cfi_endproc
 .size baz.cold.1, .-baz.cold.1
+
+#--- baz2.s
+.file "baz2.s"
+  .local baz
+  .type baz, %function
+baz:
+  .cfi_startproc
+# FDATA: 0 [unknown] 0 1 baz/2 0 1 0
+  cmpl	$0x0, %eax
+  je	baz.cold.1
+  retq
+  .cfi_endproc
+.size baz, .-baz
+
+  .section .text.cold
+  .local baz.cold.1
+  .type baz.cold.1, %function
+baz.cold.1:
+  .cfi_startproc
+  pushq	%rbp
+  movq	%rsp, %rbp
+  movl	$0x0, %eax
+  popq	%rbp
+  retq
+  .cfi_endproc
+.size baz.cold.1, .-baz.cold.1
diff --git a/bolt/test/X86/register-fragments-bolt-symbols.s b/bolt/test/X86/register-fragments-bolt-symbols.s
@@ -0,0 +1,32 @@
+# Test the heuristics for matching BOLT-added split functions.
+
+# RUN: llvm-mc --filetype=obj --triple x86_64-unknown-unknown %S/cdsplit-symbol-names.s -o %t.main.o
+# RUN: llvm-mc --filetype=obj --triple x86_64-unknown-unknown %s -o %t.chain.o
+# RUN: link_fdata %S/cdsplit-symbol-names.s %t.main.o %t.fdata
+# RUN: sed -i 's|chain|chain/2|g' %t.fdata
+# RUN: llvm-strip --strip-unneeded %t.main.o
+# RUN: llvm-objcopy --localize-symbol=chain %t.main.o
+# RUN: %clang %cflags %t.chain.o %t.main.o -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -o %t.bolt --split-functions --split-strategy=randomN \
+# RUN:   --reorder-blocks=ext-tsp --enable-bat --bolt-seed=7 --data=%t.fdata
+# RUN: llvm-objdump --syms %t.bolt | FileCheck %s --check-prefix=CHECK-SYMS
+
+# RUN: link_fdata %s %t.bolt %t.preagg PREAGG
+# PREAGG: B X:0 #chain.cold.0# 1 0
+# RUN: perf2bolt %t.bolt -p %t.preagg --pa -o %t.bat.fdata -w %t.bat.yaml -v=1 \
+# RUN:   | FileCheck %s --check-prefix=CHECK-REGISTER
+
+# CHECK-SYMS: l df *ABS*          [[#]] chain.s
+# CHECK-SYMS: l  F .bolt.org.text [[#]] chain
+# CHECK-SYMS: l  F .text.cold     [[#]] chain.cold.0
+# CHECK-SYMS: l  F .text          [[#]] chain
+# CHECK-SYMS: l df *ABS*          [[#]] bolt-pseudo.o
+
+# CHECK-REGISTER: BOLT-INFO: marking chain.cold.0/1(*2) as a fragment of chain/2(*2)
+
+.file "chain.s"
+        .text
+        .type   chain, @function
+chain:
+        ret
+        .size   chain, .-chain
diff --git a/clang-tools-extra/clang-tidy/modernize/UseNullptrCheck.h b/clang-tools-extra/clang-tidy/modernize/UseNullptrCheck.h
@@ -19,7 +19,7 @@ class UseNullptrCheck : public ClangTidyCheck {
   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
     // FIXME this should be CPlusPlus11 but that causes test cases to
     // erroneously fail.
-    return LangOpts.CPlusPlus;
+    return LangOpts.CPlusPlus || LangOpts.C23;
   }
   void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;

diff --git a/clang-tools-extra/clang-tidy/readability/AvoidReturnWithVoidValueCheck.cpp b/clang-tools-extra/clang-tidy/readability/AvoidReturnWithVoidValueCheck.cpp
@@ -64,8 +64,11 @@ void AvoidReturnWithVoidValueCheck::check(
            << BraceInsertionHints.closingBraceFixIt();
   }
   Diag << FixItHint::CreateRemoval(VoidReturn->getReturnLoc());
-  if (!Result.Nodes.getNodeAs<FunctionDecl>("function_parent") ||
-      SurroundingBlock->body_back() != VoidReturn)
+  const auto *FunctionParent =
+      Result.Nodes.getNodeAs<FunctionDecl>("function_parent");
+  if (!FunctionParent ||
+      (SurroundingBlock && SurroundingBlock->body_back() != VoidReturn))
+    // If this is not the last statement in a function body, we add a `return`.
     Diag << FixItHint::CreateInsertion(SemicolonPos.getLocWithOffset(1),
                                        " return;", true);
 }

diff --git a/clang-tools-extra/clang-tidy/readability/MathMissingParenthesesCheck.cpp b/clang-tools-extra/clang-tidy/readability/MathMissingParenthesesCheck.cpp
@@ -61,19 +61,21 @@ static void addParantheses(const BinaryOperator *BinOp,
     const clang::SourceLocation StartLoc = BinOp->getBeginLoc();
     const clang::SourceLocation EndLoc =
         clang::Lexer::getLocForEndOfToken(BinOp->getEndLoc(), 0, SM, LangOpts);
-    if (EndLoc.isInvalid())
-      return;
 
-    Check->diag(StartLoc,
-                "'%0' has higher precedence than '%1'; add parentheses to "
-                "explicitly specify the order of operations")
+    auto Diag =
+        Check->diag(StartLoc,
+                    "'%0' has higher precedence than '%1'; add parentheses to "
+                    "explicitly specify the order of operations")
         << (Precedence1 > Precedence2 ? BinOp->getOpcodeStr()
                                       : ParentBinOp->getOpcodeStr())
         << (Precedence1 > Precedence2 ? ParentBinOp->getOpcodeStr()
                                       : BinOp->getOpcodeStr())
-        << FixItHint::CreateInsertion(StartLoc, "(")
-        << FixItHint::CreateInsertion(EndLoc, ")")
         << SourceRange(StartLoc, EndLoc);
+
+    if (EndLoc.isValid()) {
+      Diag << FixItHint::CreateInsertion(StartLoc, "(")
+           << FixItHint::CreateInsertion(EndLoc, ")");
+    }
   }
 
   addParantheses(dyn_cast<BinaryOperator>(BinOp->getLHS()->IgnoreImpCasts()),

diff --git a/clang-tools-extra/clangd/unittests/FindTargetTests.cpp b/clang-tools-extra/clangd/unittests/FindTargetTests.cpp
@@ -839,9 +839,7 @@ TEST_F(TargetDeclTest, OverloadExpr) {
       [[delete]] x;
     }
   )cpp";
-  // Sized deallocation is enabled by default in C++14 onwards.
-  EXPECT_DECLS("CXXDeleteExpr",
-               "void operator delete(void *, unsigned long) noexcept");
+  EXPECT_DECLS("CXXDeleteExpr", "void operator delete(void *) noexcept");
 }
 
 TEST_F(TargetDeclTest, DependentExprs) {
@@ -856,7 +854,7 @@ TEST_F(TargetDeclTest, DependentExprs) {
           }
         };
       )cpp";
-  EXPECT_DECLS("CXXDependentScopeMemberExpr", "void foo()");
+  EXPECT_DECLS("MemberExpr", "void foo()");
 
   // Similar to above but base expression involves a function call.
   Code = R"cpp(
@@ -874,7 +872,7 @@ TEST_F(TargetDeclTest, DependentExprs) {
           }
         };
       )cpp";
-  EXPECT_DECLS("CXXDependentScopeMemberExpr", "void foo()");
+  EXPECT_DECLS("MemberExpr", "void foo()");
 
   // Similar to above but uses a function pointer.
   Code = R"cpp(
@@ -893,7 +891,7 @@ TEST_F(TargetDeclTest, DependentExprs) {
           }
         };
       )cpp";
-  EXPECT_DECLS("CXXDependentScopeMemberExpr", "void foo()");
+  EXPECT_DECLS("MemberExpr", "void foo()");
 
   // Base expression involves a member access into this.
   Code = R"cpp(
@@ -964,7 +962,7 @@ TEST_F(TargetDeclTest, DependentExprs) {
           void Foo() { this->[[find]](); }
         };
   )cpp";
-  EXPECT_DECLS("CXXDependentScopeMemberExpr", "void find()");
+  EXPECT_DECLS("MemberExpr", "void find()");
 }
 
 TEST_F(TargetDeclTest, DependentTypes) {

diff --git a/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp b/clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
@@ -621,7 +621,7 @@ sizeof...($TemplateParameter[[Elements]]);
       struct $Class_def[[Foo]] {
         int $Field_decl[[Waldo]];
         void $Method_def[[bar]]() {
-          $Class[[Foo]]().$Field_dependentName[[Waldo]];
+          $Class[[Foo]]().$Field[[Waldo]];
         }
         template $Bracket[[<]]typename $TemplateParameter_def[[U]]$Bracket[[>]]
         void $Method_def[[bar1]]() {

diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -100,13 +100,15 @@ Improvements to clang-tidy
 - Improved :program:`run-clang-tidy.py` script. Added argument `-source-filter`
   to filter source files from the compilation database, via a RegEx. In a
   similar fashion to what `-header-filter` does for header files.
+
 - Improved :program:`check_clang_tidy.py` script. Added argument `-export-fixes`
   to aid in clang-tidy and test development.
+
 - Fixed bug where big values for unsigned check options overflowed into negative values
-  when being printed with ``--dump-config``.
+  when being printed with `--dump-config`.
 
-- Fixed ``--verify-config`` option not properly parsing checks when using the 
-  literal operator in the ``.clang-tidy`` config.
+- Fixed `--verify-config` option not properly parsing checks when using the
+  literal operator in the `.clang-tidy` config.
 
 New checks
 ^^^^^^^^^^
@@ -236,7 +238,7 @@ Changes in existing checks
 
 - Improved :doc:`google-explicit-constructor
   <clang-tidy/checks/google/explicit-constructor>` check to better handle
-  ``C++-20`` `explicit(bool)`.
+  C++20 `explicit(bool)`.
 
 - Improved :doc:`google-global-names-in-headers
   <clang-tidy/checks/google/global-names-in-headers>` check by replacing the local
@@ -249,13 +251,18 @@ Changes in existing checks
   check by ignoring other functions with same prefixes as the target specific
   functions.
 
+- Improved :doc:`linuxkernel-must-check-errs
+  <clang-tidy/checks/linuxkernel/must-check-errs>` check documentation to
+  consistently use the check's proper name.
+
 - Improved :doc:`llvm-header-guard
   <clang-tidy/checks/llvm/header-guard>` check by replacing the local
   option `HeaderFileExtensions` by the global option of the same name.
 
 - Improved :doc:`misc-const-correctness
   <clang-tidy/checks/misc/const-correctness>` check by avoiding infinite recursion
-  for recursive forwarding reference.
+  for recursive functions with forwarding reference parameters and reference
+  variables which refer to themselves.
 
 - Improved :doc:`misc-definitions-in-headers
   <clang-tidy/checks/misc/definitions-in-headers>` check by replacing the local
@@ -281,6 +288,10 @@ Changes in existing checks
   don't remove parentheses used in ``sizeof`` calls when they have array index
   accesses as arguments.
 
+- Improved :doc:`modernize-use-nullptr
+  <clang-tidy/checks/modernize/use-nullptr>` check to include support for C23,
+  which also has introduced the ``nullptr`` keyword.
+
 - Improved :doc:`modernize-use-override
   <clang-tidy/checks/modernize/use-override>` check to also remove any trailing
   whitespace when deleting the ``virtual`` keyword.
@@ -336,13 +347,9 @@ Miscellaneous
 ^^^^^^^^^^^^^
 
 - Fixed incorrect formatting in :program:`clang-apply-replacements` when no
-  ``--format`` option is specified. Now :program:`clang-apply-replacements`
+  `--format` option is specified. Now :program:`clang-apply-replacements`
   applies formatting only with the option.
 
-- Fixed the :doc:`linuxkernel-must-check-errs
-  <clang-tidy/checks/linuxkernel/must-check-errs>` documentation to consistently
-  use the check's proper name.
-
 Improvements to include-fixer
 -----------------------------
 

diff --git a/clang-tools-extra/docs/clang-tidy/checks/modernize/use-nullptr.rst b/clang-tools-extra/docs/clang-tidy/checks/modernize/use-nullptr.rst
@@ -4,7 +4,7 @@ modernize-use-nullptr
 =====================
 
 The check converts the usage of null pointer constants (e.g. ``NULL``, ``0``)
-to use the new C++11 ``nullptr`` keyword.
+to use the new C++11 and C23 ``nullptr`` keyword.
 
 Example
 -------

diff --git a/clang-tools-extra/test/CMakeLists.txt b/clang-tools-extra/test/CMakeLists.txt
@@ -67,33 +67,30 @@ foreach(dep ${LLVM_UTILS_DEPS})
   endif()
 endforeach()
 
-if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-  if (NOT WIN32 OR NOT LLVM_LINK_LLVM_DYLIB)
-    llvm_add_library(
-        CTTestTidyModule
-        MODULE clang-tidy/CTTestTidyModule.cpp
-        PLUGIN_TOOL clang-tidy
-        DEPENDS clang-tidy-headers)
-  endif()
+if (NOT WIN32 OR NOT LLVM_LINK_LLVM_DYLIB)
+  llvm_add_library(
+      CTTestTidyModule
+      MODULE clang-tidy/CTTestTidyModule.cpp
+      PLUGIN_TOOL clang-tidy)
+endif()
 
-  if(CLANG_BUILT_STANDALONE)
-    # LLVMHello library is needed below
-    if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Transforms/Hello
-       AND NOT TARGET LLVMHello)
-      add_subdirectory(${LLVM_MAIN_SRC_DIR}/lib/Transforms/Hello
-        lib/Transforms/Hello)
-    endif()
+if(CLANG_BUILT_STANDALONE)
+  # LLVMHello library is needed below
+  if (EXISTS ${LLVM_MAIN_SRC_DIR}/lib/Transforms/Hello
+      AND NOT TARGET LLVMHello)
+    add_subdirectory(${LLVM_MAIN_SRC_DIR}/lib/Transforms/Hello
+      lib/Transforms/Hello)
   endif()
+endif()
 
-  if(TARGET CTTestTidyModule)
-      list(APPEND CLANG_TOOLS_TEST_DEPS CTTestTidyModule LLVMHello)
-      target_include_directories(CTTestTidyModule PUBLIC BEFORE "${CLANG_TOOLS_SOURCE_DIR}")
-      if(CLANG_PLUGIN_SUPPORT AND (WIN32 OR CYGWIN))
-        set(LLVM_LINK_COMPONENTS
-          Support
-        )
-      endif()
-  endif()
+if(TARGET CTTestTidyModule)
+    list(APPEND CLANG_TOOLS_TEST_DEPS CTTestTidyModule LLVMHello)
+    target_include_directories(CTTestTidyModule PUBLIC BEFORE "${CLANG_TOOLS_SOURCE_DIR}")
+    if(CLANG_PLUGIN_SUPPORT AND (WIN32 OR CYGWIN))
+      set(LLVM_LINK_COMPONENTS
+        Support
+      )
+    endif()
 endif()
 
 add_lit_testsuite(check-clang-extra "Running clang-tools-extra/test"

diff --git a/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines/owning-memory.cpp b/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines/owning-memory.cpp
@@ -309,6 +309,8 @@ struct HeapArray {                                          // Ok, since destruc
 
   HeapArray(HeapArray &&other) : _data(other._data), size(other.size) { // Ok
     other._data = nullptr;                                              // Ok
+    // CHECK-NOTES: [[@LINE-1]]:5: warning: expected assignment source to be of type 'gsl::owner<>'; got 'std::nullptr_t'
+    // FIXME: This warning is emitted because an ImplicitCastExpr for the NullToPointer conversion isn't created for dependent types.
     other.size = 0;
   }
 

diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/new-delete-overloads.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc/new-delete-overloads.cpp
@@ -12,6 +12,16 @@ struct S {
 // CHECK-MESSAGES: :[[@LINE+1]]:7: warning: declaration of 'operator new' has no matching declaration of 'operator delete' at the same scope
 void *operator new(size_t size) noexcept(false);
 
+struct T {
+  // Sized deallocations are not enabled by default, and so this new/delete pair
+  // does not match. However, we expect only one warning, for the new, because
+  // the operator delete is a placement delete and we do not warn on mismatching
+  // placement operations.
+  // CHECK-MESSAGES: :[[@LINE+1]]:9: warning: declaration of 'operator new' has no matching declaration of 'operator delete' at the same scope
+  void *operator new(size_t size) noexcept;
+  void operator delete(void *ptr, size_t) noexcept; // ok only if sized deallocation is enabled
+};
+
 struct U {
   void *operator new(size_t size) noexcept;
   void operator delete(void *ptr) noexcept;

diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-equals-default-copy.cpp b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-equals-default-copy.cpp
@@ -260,6 +260,8 @@ template <class T>
 struct Template {
   Template() = default;
   Template(const Template &Other) : Field(Other.Field) {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use '= default'
+  // CHECK-FIXES: Template(const Template &Other)  = default;
   Template &operator=(const Template &Other);
   void foo(const T &t);
   int Field;
@@ -269,8 +271,12 @@ Template<T> &Template<T>::operator=(const Template<T> &Other) {
   Field = Other.Field;
   return *this;
 }
+// CHECK-MESSAGES: :[[@LINE-4]]:27: warning: use '= default'
+// CHECK-FIXES: Template<T> &Template<T>::operator=(const Template<T> &Other) = default;
+
 Template<int> T1;
 
+
 // Dependent types.
 template <class T>
 struct DT1 {
@@ -284,6 +290,9 @@ DT1<T> &DT1<T>::operator=(const DT1<T> &Other) {
   Field = Other.Field;
   return *this;
 }
+// CHECK-MESSAGES: :[[@LINE-4]]:17: warning: use '= default'
+// CHECK-FIXES: DT1<T> &DT1<T>::operator=(const DT1<T> &Other) = default;
+
 DT1<int> Dt1;
 
 template <class T>
@@ -303,6 +312,9 @@ DT2<T> &DT2<T>::operator=(const DT2<T> &Other) {
 struct T {
   typedef int TT;
 };
+// CHECK-MESSAGES: :[[@LINE-8]]:17: warning: use '= default'
+// CHECK-FIXES: DT2<T> &DT2<T>::operator=(const DT2<T> &Other) = default;
+
 DT2<T> Dt2;
 
 // Default arguments.

diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-nullptr-c23.c b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-nullptr-c23.c
@@ -0,0 +1,139 @@
+// RUN: %check_clang_tidy %s modernize-use-nullptr %t -- -- -std=c23
+
+#define NULL 0
+
+void test_assignment() {
+  int *p1 = 0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: use nullptr [modernize-use-nullptr]
+  // CHECK-FIXES: int *p1 = nullptr;
+  p1 = 0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use nullptr
+  // CHECK-FIXES: p1 = nullptr;
+
+  int *p2 = NULL;
+  // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: use nullptr
+  // CHECK-FIXES: int *p2 = nullptr;
+
+  p2 = p1;
+  // CHECK-FIXES: p2 = p1;
+
+  const int null = 0;
+  int *p3 = &null;
+
+  p3 = NULL;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use nullptr
+  // CHECK-FIXES: p3 = nullptr;
+
+  int *p4 = p3;
+
+  int i1 = 0;
+
+  int i2 = NULL;
+
+  int i3 = null;
+
+  int *p5, *p6, *p7;
+  p5 = p6 = p7 = NULL;
+  // CHECK-MESSAGES: :[[@LINE-1]]:18: warning: use nullptr
+  // CHECK-FIXES: p5 = p6 = p7 = nullptr;
+}
+
+void test_function(int *p) {}
+
+void test_function_no_ptr_param(int i) {}
+
+void test_function_call() {
+  test_function(0);
+  // CHECK-MESSAGES: :[[@LINE-1]]:17: warning: use nullptr
+  // CHECK-FIXES: test_function(nullptr);
+
+  test_function(NULL);
+  // CHECK-MESSAGES: :[[@LINE-1]]:17: warning: use nullptr
+  // CHECK-FIXES: test_function(nullptr);
+
+  test_function_no_ptr_param(0);
+}
+
+char *test_function_return1() {
+  return 0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: use nullptr
+  // CHECK-FIXES: return nullptr;
+}
+
+void *test_function_return2() {
+  return NULL;
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: use nullptr
+  // CHECK-FIXES: return nullptr;
+}
+
+int test_function_return4() {
+  return 0;
+}
+
+int test_function_return5() {
+  return NULL;
+}
+
+int *test_function_return_cast1() {
+  return(int)0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:9: warning: use nullptr
+  // CHECK-FIXES: return nullptr;
+}
+
+int *test_function_return_cast2() {
+#define RET return
+  RET(int)0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: use nullptr
+  // CHECK-FIXES: RET nullptr;
+#undef RET
+}
+
+// Test parentheses expressions resulting in a nullptr.
+int *test_parentheses_expression1() {
+  return(0);
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: use nullptr
+  // CHECK-FIXES: return(nullptr);
+}
+
+int *test_parentheses_expression2() {
+  return((int)(0.0f));
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: use nullptr
+  // CHECK-FIXES: return(nullptr);
+}
+
+int *test_nested_parentheses_expression() {
+  return((((0))));
+  // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: use nullptr
+  // CHECK-FIXES: return((((nullptr))));
+}
+
+void test_const_pointers() {
+  const int *const_p1 = 0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: use nullptr
+  // CHECK-FIXES: const int *const_p1 = nullptr;
+  const int *const_p2 = NULL;
+  // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: use nullptr
+  // CHECK-FIXES: const int *const_p2 = nullptr;
+  const int *const_p3 = (int)0;
+  // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: use nullptr
+  // CHECK-FIXES: const int *const_p3 = nullptr;
+  const int *const_p4 = (int)0.0f;
+  // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: use nullptr
+  // CHECK-FIXES: const int *const_p4 = nullptr;
+}
+
+void test_nested_implicit_cast_expr() {
+  int func0(void*, void*);
+  int func1(int, void*, void*);
+
+  (double)func1(0, 0, 0);
+  // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: use nullptr
+  // CHECK-MESSAGES: :[[@LINE-2]]:23: warning: use nullptr
+  // CHECK-FIXES: (double)func1(0, nullptr, nullptr);
+  (double)func1(func0(0, 0), 0, 0);
+  // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: use nullptr
+  // CHECK-MESSAGES: :[[@LINE-2]]:26: warning: use nullptr
+  // CHECK-MESSAGES: :[[@LINE-3]]:30: warning: use nullptr
+  // CHECK-MESSAGES: :[[@LINE-4]]:33: warning: use nullptr
+  // CHECK-FIXES: (double)func1(func0(nullptr, nullptr), nullptr, nullptr);
+}
diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-nullptr.c b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-nullptr.c
@@ -1,4 +1,4 @@
-// RUN: clang-tidy %s -checks=-*,modernize-use-nullptr -- | count 0
+// RUN: clang-tidy %s -checks=-*,modernize-use-nullptr -- -std=c17 | count 0
 
 // Note: this test expects no diagnostics, but FileCheck cannot handle that,
 // hence the use of | count 0.

diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/math-missing-parentheses.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/math-missing-parentheses.cpp
@@ -16,6 +16,13 @@ int bar(){
     return 4;
 }
 
+int sink(int);
+#define FUN(ARG) (sink(ARG))
+#define FUN2(ARG) sink((ARG))
+#define FUN3(ARG) sink(ARG)
+#define FUN4(ARG) sink(1 + ARG)
+#define FUN5(ARG) sink(4 * ARG)
+
 class fun{
 public:
     int A;
@@ -117,4 +124,19 @@ void f(){
     //CHECK-MESSAGES: :[[@LINE+2]]:94: warning: '/' has higher precedence than '-'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
     //CHECK-FIXES: int q = (1 MACRO_ADD (2 MACRO_MULTIPLY 3)) MACRO_OR ((4 MACRO_AND 5) MACRO_XOR (6 MACRO_SUBTRACT (7 MACRO_DIVIDE 8)));
     int q = 1 MACRO_ADD 2 MACRO_MULTIPLY 3 MACRO_OR 4 MACRO_AND 5 MACRO_XOR 6 MACRO_SUBTRACT 7 MACRO_DIVIDE 8; // No warning
+
+    //CHECK-MESSAGES: :[[@LINE+1]]:21: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
+    int r = FUN(0 + 1 * 2);
+
+    //CHECK-MESSAGES: :[[@LINE+1]]:22: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
+    int s = FUN2(0 + 1 * 2);
+
+    //CHECK-MESSAGES: :[[@LINE+1]]:22: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
+    int t = FUN3(0 + 1 * 2);
+
+    //CHECK-MESSAGES: :[[@LINE+1]]:18: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
+    int u = FUN4(1 * 2);
+
+    //CHECK-MESSAGES: :[[@LINE+1]]:13: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
+    int v = FUN5(0 + 1);
 }
diff --git a/clang-tools-extra/test/lit.site.cfg.py.in b/clang-tools-extra/test/lit.site.cfg.py.in
@@ -10,7 +10,7 @@ config.python_executable = "@Python3_EXECUTABLE@"
 config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.host_triple = "@LLVM_HOST_TRIPLE@"
 config.clang_tidy_staticanalyzer = @CLANG_TIDY_ENABLE_STATIC_ANALYZER@
-config.has_plugins = @CLANG_PLUGIN_SUPPORT@ & ~@LLVM_INSTALL_TOOLCHAIN_ONLY@
+config.has_plugins = @CLANG_PLUGIN_SUPPORT@
 # Support substitution of the tools and libs dirs with user parameters. This is
 # used when we can't determine the tool dir at configuration time.
 config.llvm_tools_dir = lit_config.substitute("@LLVM_TOOLS_DIR@")

diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
@@ -82,6 +82,7 @@ set(LLVM_ENABLE_PROJECTS ${STAGE1_PROJECTS} CACHE STRING "")
 # stage2-instrumented and Final Stage Config:
 # Options that need to be set in both the instrumented stage (if we are doing
 # a pgo build) and the final stage.
+set_instrument_and_final_stage_var(CMAKE_POSITION_INDEPENDENT_CODE "ON" STRING)
 set_instrument_and_final_stage_var(LLVM_ENABLE_LTO "${LLVM_RELEASE_ENABLE_LTO}" STRING)
 if (LLVM_RELEASE_ENABLE_LTO)
   set_instrument_and_final_stage_var(LLVM_ENABLE_LLD "ON" BOOL)

diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
@@ -711,6 +711,8 @@ even-odd element pair with indices ``i * 2`` and ``i * 2 + 1`` with
 power of 2, the vector is widened with neutral elements for the reduction
 at the end to the next power of 2.
 
+These reductions support both fixed-sized and scalable vector types.
+
 Example:
 
 .. code-block:: c++
@@ -1493,6 +1495,7 @@ Conditional ``explicit``                     __cpp_conditional_explicit       C+
 ``if consteval``                             __cpp_if_consteval               C++23         C++20
 ``static operator()``                        __cpp_static_call_operator       C++23         C++03
 Attributes on Lambda-Expressions                                              C++23         C++11
+Attributes on Structured Bindings            __cpp_structured_bindings        C++26         C++03
 ``= delete ("should have a reason");``       __cpp_deleted_function           C++26         C++03
 -------------------------------------------- -------------------------------- ------------- -------------
 Designated initializers (N494)                                                C99           C89
@@ -2928,7 +2931,7 @@ Query for this feature with ``__has_builtin(__builtin_dump_struct)``
 ``__builtin_shufflevector`` is used to express generic vector
 permutation/shuffle/swizzle operations.  This builtin is also very important
 for the implementation of various target-specific header files like
-``<xmmintrin.h>``.
+``<xmmintrin.h>``. This builtin can be used within constant expressions.
 
 **Syntax**:
 
@@ -2955,7 +2958,7 @@ for the implementation of various target-specific header files like
   // Concatenate every other element of 8-element vectors V1 and V2.
   __builtin_shufflevector(V1, V2, 0, 2, 4, 6, 8, 10, 12, 14)
 
-  // Shuffle v1 with some elements being undefined
+  // Shuffle v1 with some elements being undefined. Not allowed in constexpr.
   __builtin_shufflevector(v1, v1, 3, -1, 1, -1)
 
 **Description**:
@@ -2968,6 +2971,7 @@ starting with the first vector, continuing into the second vector.  Thus, if
 ``vec1`` is a 4-element vector, index 5 would refer to the second element of
 ``vec2``. An index of -1 can be used to indicate that the corresponding element
 in the returned vector is a don't care and can be optimized by the backend.
+Values of -1 are not supported in constant expressions.
 
 The result of ``__builtin_shufflevector`` is a vector with the same element
 type as ``vec1``/``vec2`` but that has an element count equal to the number of
@@ -2982,7 +2986,8 @@ Query for this feature with ``__has_builtin(__builtin_shufflevector)``.
 
 ``__builtin_convertvector`` is used to express generic vector
 type-conversion operations. The input vector and the output vector
-type must have the same number of elements.
+type must have the same number of elements. This builtin can be used within
+constant expressions.
 
 **Syntax**:
 

diff --git a/clang/docs/LibTooling.rst b/clang/docs/LibTooling.rst
@@ -63,15 +63,22 @@ and automatic location of the compilation database using source files paths.
   #include "llvm/Support/CommandLine.h"
 
   using namespace clang::tooling;
+  using namespace llvm;
 
   // Apply a custom category to all command-line options so that they are the
   // only ones displayed.
-  static llvm::cl::OptionCategory MyToolCategory("my-tool options");
+  static cl::OptionCategory MyToolCategory("my-tool options");
 
   int main(int argc, const char **argv) {
-    // CommonOptionsParser constructor will parse arguments and create a
-    // CompilationDatabase.  In case of error it will terminate the program.
-    CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
+    // CommonOptionsParser::create will parse arguments and create a
+    // CompilationDatabase.
+    auto ExpectedParser = CommonOptionsParser::create(argc, argv, MyToolCategory);
+    if (!ExpectedParser) {
+      // Fail gracefully for unsupported options.
+      llvm::errs() << ExpectedParser.takeError();
+      return 1;
+    }
+    CommonOptionsParser& OptionsParser = ExpectedParser.get();
 
     // Use OptionsParser.getCompilations() and OptionsParser.getSourcePathList()
     // to retrieve CompilationDatabase and the list of input file paths.
@@ -133,7 +140,12 @@ version of this example tool is also checked into the clang tree at
   static cl::extrahelp MoreHelp("\nMore help text...\n");
 
   int main(int argc, const char **argv) {
-    CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
+    auto ExpectedParser = CommonOptionsParser::create(argc, argv, MyToolCategory);
+    if (!ExpectedParser) {
+      llvm::errs() << ExpectedParser.takeError();
+      return 1;
+    }
+    CommonOptionsParser& OptionsParser = ExpectedParser.get();
     ClangTool Tool(OptionsParser.getCompilations(),
                    OptionsParser.getSourcePathList());
     return Tool.run(newFrontendActionFactory<clang::SyntaxOnlyAction>().get());

diff --git a/clang/docs/Multilib.rst b/clang/docs/Multilib.rst
@@ -188,9 +188,9 @@ For a more comprehensive example see
   - Dir: thumb/v6-m
     # List of one or more normalized command line options, as generated by Clang
     # from the command line options or from Mappings below.
-    # Here, if the flags are a superset of {target=thumbv6m-none-unknown-eabi}
+    # Here, if the flags are a superset of {target=thumbv6m-unknown-none-eabi}
     # then this multilib variant will be considered a match.
-    Flags: [--target=thumbv6m-none-unknown-eabi]
+    Flags: [--target=thumbv6m-unknown-none-eabi]
 
   # Similarly, a multilib variant targeting Arm v7-M with an FPU (floating
   # point unit).

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -63,6 +63,12 @@ ABI Changes in This Version
   MSVC uses a different mangling for these objects, compatibility is not affected.
   (#GH85423).
 
+- Fixed Microsoft calling convention for returning certain classes with a
+  templated constructor. If a class has a templated constructor, it should
+  be returned indirectly even if it meets all the other requirements for
+  returning a class in a register. This affects some uses of std::pair.
+  (#GH86384).
+
 AST Dumping Potentially Breaking Changes
 ----------------------------------------
 
@@ -90,11 +96,6 @@ C++ Language Changes
 --------------------
 - Implemented ``_BitInt`` literal suffixes ``__wb`` or ``__WB`` as a Clang extension with ``unsigned`` modifiers also allowed. (#GH85223).
 
-C++14 Feature Support
-^^^^^^^^^^^^^^^^^^^^^
-- Sized deallocation is enabled by default in C++14 onwards. The user may specify
-  ``-fno-sized-deallocation`` to disable it if there are some regressions.
-
 C++17 Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 - Clang now exposes ``__GCC_DESTRUCTIVE_SIZE`` and ``__GCC_CONSTRUCTIVE_SIZE``
@@ -148,6 +149,9 @@ C++2c Feature Support
 
 - Implemented `P2573R2: = delete("should have a reason"); <https://wg21.link/P2573R2>`_
 
+- Implemented `P0609R3: Attributes for Structured Bindings <https://wg21.link/P0609R3>`_
+
+- Implemented `P2748R5 Disallow Binding a Returned Glvalue to a Temporary <https://wg21.link/P2748R5>`_.
 
 Resolutions to C++ Defect Reports
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -224,6 +228,7 @@ Non-comprehensive list of changes in this release
 - ``__typeof_unqual__`` is available in all C modes as an extension, which behaves
   like ``typeof_unqual`` from C23, similar to ``__typeof__`` and ``typeof``.
 
+- ``__builtin_reduce_{add|mul|xor|or|and|min|max}`` builtins now support scalable vectors.
 
 * Shared libraries linked with either the ``-ffast-math``, ``-Ofast``, or
   ``-funsafe-math-optimizations`` flags will no longer enable flush-to-zero
@@ -234,6 +239,9 @@ Non-comprehensive list of changes in this release
 * ``-fdenormal-fp-math=preserve-sign`` is no longer implied by ``-ffast-math``
   on x86 systems.
 
+- Builtins ``__builtin_shufflevector()`` and ``__builtin_convertvector()`` may
+  now be used within constant expressions.
+
 New Compiler Flags
 ------------------
 - ``-fsanitize=implicit-bitfield-conversion`` checks implicit truncation and
@@ -248,6 +256,10 @@ New Compiler Flags
 - ``-fexperimental-modules-reduced-bmi`` enables the Reduced BMI for C++20 named modules.
   See the document of standard C++ modules for details.
 
+- ``-fexperimental-late-parse-attributes`` enables an experimental feature to
+  allow late parsing certain attributes in specific contexts where they would
+  not normally be late parsed.
+
 Deprecated Compiler Flags
 -------------------------
 
@@ -402,6 +414,18 @@ Improvements to Clang's diagnostics
 
 - Clang now diagnoses requires expressions with explicit object parameters.
 
+- Clang now looks up members of the current instantiation in the template definition context
+  if the current instantiation has no dependent base classes.
+
+  .. code-block:: c++
+
+     template<typename T>
+     struct A {
+       int f() {
+         return this->x; // error: no member named 'x' in 'A<T>'
+       }
+     };
+
 Improvements to Clang's time-trace
 ----------------------------------
 
@@ -448,6 +472,9 @@ Bug Fixes in This Version
 - Clang now correctly generates overloads for bit-precise integer types for
   builtin operators in C++. Fixes #GH82998.
 
+- Fix crash when destructor definition is preceded with an equals sign.
+  Fixes (#GH89544).
+
 - When performing mixed arithmetic between ``_Complex`` floating-point types and integers,
   Clang now correctly promotes the integer to its corresponding real floating-point
   type only rather than to the complex type (e.g. ``_Complex float / int`` is now evaluated
@@ -463,6 +490,10 @@ Bug Fixes in This Version
 
 - Fixed an assertion failure on invalid InitListExpr in C89 mode (#GH88008).
 
+- Fixed missing destructor calls when we branch from middle of an expression.
+  This could happen through a branch in stmt-expr or in an expression containing a coroutine
+  suspension. Fixes (#GH63818) (#GH88478).
+
 - Clang will no longer diagnose an erroneous non-dependent ``switch`` condition
   during instantiation, and instead will only diagnose it once, during checking
   of the function template.
@@ -593,6 +624,12 @@ Bug Fixes to C++ Support
 - Fixed a use-after-free bug in parsing of type constraints with default arguments that involve lambdas. (#GH67235)
 - Fixed bug in which the body of a consteval lambda within a template was not parsed as within an
   immediate function context.
+- Fix CTAD for ``std::initializer_list``. This allows ``std::initializer_list{1, 2, 3}`` to be deduced as
+  ``std::initializer_list<int>`` as intended.
+- Fix a bug on template partial specialization whose template parameter is `decltype(auto)`.
+- Fix a bug on template partial specialization with issue on deduction of nontype template parameter
+  whose type is `decltype(auto)`. Fixes (#GH68885).
+- Clang now correctly treats the noexcept-specifier of a friend function to be a complete-class context.
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -645,6 +682,7 @@ Arm and AArch64 Support
     * Arm Cortex-A78AE (cortex-a78ae).
     * Arm Cortex-A520AE (cortex-a520ae).
     * Arm Cortex-A720AE (cortex-a720ae).
+    * Arm Cortex-R82AE (cortex-r82ae).
     * Arm Neoverse-N3 (neoverse-n3).
     * Arm Neoverse-V3 (neoverse-v3).
     * Arm Neoverse-V3AE (neoverse-v3ae).
@@ -704,6 +742,11 @@ AIX Support
 WebAssembly Support
 ^^^^^^^^^^^^^^^^^^^
 
+The -mcpu=generic configuration now enables multivalue feature, which is
+standardized and available in all major engines. Enabling multivalue here only
+enables the language feature but does not turn on the multivalue ABI (this
+enables non-ABI uses of multivalue, like exnref).
+
 AVR Support
 ^^^^^^^^^^^
 

diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst
@@ -1452,8 +1452,6 @@ floating point semantic models: precise (the default), strict, and fast.
   "fenv_access", "off", "on", "off"
   "rounding_mode", "tonearest", "dynamic", "tonearest"
   "contract", "on", "off", "fast"
-  "denormal_fp_math", "IEEE", "IEEE", "IEEE"
-  "denormal_fp32_math", "IEEE","IEEE", "IEEE"
   "support_math_errno", "on", "on", "off"
   "no_honor_nans", "off", "off", "on"
   "no_honor_infinities", "off", "off", "on"
@@ -1462,6 +1460,14 @@ floating point semantic models: precise (the default), strict, and fast.
   "allow_approximate_fns", "off", "off", "on"
   "allow_reassociation", "off", "off", "on"
 
+The ``-ffp-model`` option does not modify the ``fdenormal-fp-math``
+setting, but it does have an impact on whether ``crtfastmath.o`` is
+linked. Because linking ``crtfastmath.o`` has a global effect on the
+program, and because the global denormal handling can be changed in
+other ways, the state of ``fdenormal-fp-math`` handling cannot
+be assumed in any function based on fp-model. See :ref:`crtfastmath.o`
+for more details.
+
 .. option:: -ffast-math
 
    Enable fast-math mode.  This option lets the
@@ -1537,7 +1543,6 @@ floating point semantic models: precise (the default), strict, and fast.
    Also, this option resets following options to their target-dependent defaults.
 
    * ``-f[no-]math-errno``
-   * ``-fdenormal-fp-math=<value>``
 
    There is ambiguity about how ``-ffp-contract``, ``-ffast-math``,
    and ``-fno-fast-math`` behave when combined. To keep the value of
@@ -1560,8 +1565,7 @@ floating point semantic models: precise (the default), strict, and fast.
      ``-ffp-contract`` setting is determined by the default value of
      ``-ffp-contract``.
 
-   Note: ``-fno-fast-math`` implies ``-fdenormal-fp-math=ieee``.
-   ``-fno-fast-math`` causes ``crtfastmath.o`` to not be linked with code
+   Note: ``-fno-fast-math`` causes ``crtfastmath.o`` to not be linked with code
    unless ``-mdaz-ftz`` is present.
 
 .. option:: -fdenormal-fp-math=<value>
@@ -1692,9 +1696,7 @@ floating point semantic models: precise (the default), strict, and fast.
    * ``-fno-associative-math``
    * ``-fno-reciprocal-math``
    * ``-fsigned-zeros``
-   * ``-ftrapping-math``
    * ``-ffp-contract=on``
-   * ``-fdenormal-fp-math=ieee``
 
    There is ambiguity about how ``-ffp-contract``,
    ``-funsafe-math-optimizations``, and ``-fno-unsafe-math-optimizations``
@@ -2319,6 +2321,8 @@ are listed below.
    on ELF targets when using the integrated assembler. This flag currently
    only has an effect on ELF targets.
 
+.. _funique_internal_linkage_names:
+
 .. option:: -f[no]-unique-internal-linkage-names
 
    Controls whether Clang emits a unique (best-effort) symbol name for internal
@@ -2448,27 +2452,41 @@ usual build cycle when using sample profilers for optimization:
    usual build flags that you always build your application with. The only
    requirement is that DWARF debug info including source line information is
    generated. This DWARF information is important for the profiler to be able
-   to map instructions back to source line locations.
+   to map instructions back to source line locations. The usefulness of this
+   DWARF information can be improved with the ``-fdebug-info-for-profiling``
+   and ``-funique-internal-linkage-names`` options.
 
-   On Linux, ``-g`` or just ``-gline-tables-only`` is sufficient:
+   On Linux:
 
    .. code-block:: console
 
-     $ clang++ -O2 -gline-tables-only code.cc -o code
+     $ clang++ -O2 -gline-tables-only \
+       -fdebug-info-for-profiling -funique-internal-linkage-names \
+       code.cc -o code
 
    While MSVC-style targets default to CodeView debug information, DWARF debug
    information is required to generate source-level LLVM profiles. Use
    ``-gdwarf`` to include DWARF debug information:
 
-   .. code-block:: console
+   .. code-block:: winbatch
+
+     > clang-cl /O2 -gdwarf -gline-tables-only ^
+       /clang:-fdebug-info-for-profiling /clang:-funique-internal-linkage-names ^
+       code.cc /Fe:code /fuse-ld=lld /link /debug:dwarf
 
-     $ clang-cl -O2 -gdwarf -gline-tables-only coff-profile.cpp -fuse-ld=lld -link -debug:dwarf
+.. note::
+
+   :ref:`-funique-internal-linkage-names <funique_internal_linkage_names>`
+   generates unique names based on given command-line source file paths. If
+   your build system uses absolute source paths and these paths may change
+   between steps 1 and 4, then the uniqued function names may change and result
+   in unused profile data. Consider omitting this option in such cases.
 
 2. Run the executable under a sampling profiler. The specific profiler
    you use does not really matter, as long as its output can be converted
    into the format that the LLVM optimizer understands.
 
-   Two such profilers are the the Linux Perf profiler
+   Two such profilers are the Linux Perf profiler
    (https://perf.wiki.kernel.org/) and Intel's Sampling Enabling Product (SEP),
    available as part of `Intel VTune
    <https://software.intel.com/content/www/us/en/develop/tools/oneapi/components/vtune-profiler.html>`_.
@@ -2482,7 +2500,9 @@ usual build cycle when using sample profilers for optimization:
 
    .. code-block:: console
 
-     $ perf record -b ./code
+     $ perf record -b -e BR_INST_RETIRED.NEAR_TAKEN:uppp ./code
+
+   If the event above is unavailable, ``branches:u`` is probably next-best.
 
    Note the use of the ``-b`` flag. This tells Perf to use the Last Branch
    Record (LBR) to record call chains. While this is not strictly required,
@@ -2532,21 +2552,42 @@ usual build cycle when using sample profilers for optimization:
    that executes faster than the original one. Note that you are not
    required to build the code with the exact same arguments that you
    used in the first step. The only requirement is that you build the code
-   with ``-gline-tables-only`` and ``-fprofile-sample-use``.
+   with the same debug info options and ``-fprofile-sample-use``.
+
+   On Linux:
 
    .. code-block:: console
 
-     $ clang++ -O2 -gline-tables-only -fprofile-sample-use=code.prof code.cc -o code
+     $ clang++ -O2 -gline-tables-only \
+       -fdebug-info-for-profiling -funique-internal-linkage-names \
+       -fprofile-sample-use=code.prof code.cc -o code
 
-  [OPTIONAL] Sampling-based profiles can have inaccuracies or missing block/
-  edge counters. The profile inference algorithm (profi) can be used to infer
-  missing blocks and edge counts, and improve the quality of profile data.
-  Enable it with ``-fsample-profile-use-profi``.
+   On Windows:
 
-  .. code-block:: console
+   .. code-block:: winbatch
+
+     > clang-cl /O2 -gdwarf -gline-tables-only ^
+       /clang:-fdebug-info-for-profiling /clang:-funique-internal-linkage-names ^
+       /fprofile-sample-use=code.prof code.cc /Fe:code /fuse-ld=lld /link /debug:dwarf
+
+   [OPTIONAL] Sampling-based profiles can have inaccuracies or missing block/
+   edge counters. The profile inference algorithm (profi) can be used to infer
+   missing blocks and edge counts, and improve the quality of profile data.
+   Enable it with ``-fsample-profile-use-profi``. For example, on Linux:
+
+   .. code-block:: console
+
+     $ clang++ -fsample-profile-use-profi -O2 -gline-tables-only \
+       -fdebug-info-for-profiling -funique-internal-linkage-names \
+       -fprofile-sample-use=code.prof code.cc -o code
+
+   On Windows:
+
+   .. code-block:: winbatch
 
-    $ clang++ -O2 -gline-tables-only -fprofile-sample-use=code.prof \
-      -fsample-profile-use-profi code.cc -o code
+     > clang-cl /clang:-fsample-profile-use-profi /O2 -gdwarf -gline-tables-only ^
+       /clang:-fdebug-info-for-profiling /clang:-funique-internal-linkage-names ^
+       /fprofile-sample-use=code.prof code.cc /Fe:code /fuse-ld=lld /link /debug:dwarf
 
 Sample Profile Formats
 """"""""""""""""""""""

diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
@@ -1462,6 +1462,99 @@ checker).
 
 Default value of the option is ``true``.
 
+.. _unix-Stream:
+
+unix.Stream (C)
+"""""""""""""""
+Check C stream handling functions:
+``fopen, fdopen, freopen, tmpfile, fclose, fread, fwrite, fgetc, fgets, fputc, fputs, fprintf, fscanf, ungetc, getdelim, getline, fseek, fseeko, ftell, ftello, fflush, rewind, fgetpos, fsetpos, clearerr, feof, ferror, fileno``.
+
+The checker maintains information about the C stream objects (``FILE *``) and
+can detect error conditions related to use of streams. The following conditions
+are detected:
+
+* The ``FILE *`` pointer passed to the function is NULL (the single exception is
+  ``fflush`` where NULL is allowed).
+* Use of stream after close.
+* Opened stream is not closed.
+* Read from a stream after end-of-file. (This is not a fatal error but reported
+  by the checker. Stream remains in EOF state and the read operation fails.)
+* Use of stream when the file position is indeterminate after a previous failed
+  operation. Some functions (like ``ferror``, ``clearerr``, ``fseek``) are
+  allowed in this state.
+* Invalid 3rd ("``whence``") argument to ``fseek``.
+
+The stream operations are by this checker usually split into two cases, a success
+and a failure case. However, in the case of write operations (like ``fwrite``,
+``fprintf`` and even ``fsetpos``) this behavior could produce a large amount of
+unwanted reports on projects that don't have error checks around the write
+operations, so by default the checker assumes that write operations always succeed.
+This behavior can be controlled by the ``Pedantic`` flag: With
+``-analyzer-config unix.Stream:Pedantic=true`` the checker will model the
+cases where a write operation fails and report situations where this leads to
+erroneous behavior. (The default is ``Pedantic=false``, where write operations
+are assumed to succeed.)
+
+.. code-block:: c
+
+ void test1() {
+   FILE *p = fopen("foo", "r");
+ } // warn: opened file is never closed
+
+ void test2() {
+   FILE *p = fopen("foo", "r");
+   fseek(p, 1, SEEK_SET); // warn: stream pointer might be NULL
+   fclose(p);
+ }
+
+ void test3() {
+   FILE *p = fopen("foo", "r");
+   if (p) {
+     fseek(p, 1, 3); // warn: third arg should be SEEK_SET, SEEK_END, or SEEK_CUR
+     fclose(p);
+   }
+ }
+
+ void test4() {
+   FILE *p = fopen("foo", "r");
+   if (!p)
+     return;
+
+   fclose(p);
+   fclose(p); // warn: stream already closed
+ }
+
+ void test5() {
+   FILE *p = fopen("foo", "r");
+   if (!p)
+     return;
+
+   fgetc(p);
+   if (!ferror(p))
+     fgetc(p); // warn: possible read after end-of-file
+
+   fclose(p);
+ }
+
+ void test6() {
+   FILE *p = fopen("foo", "r");
+   if (!p)
+     return;
+
+   fgetc(p);
+   if (!feof(p))
+     fgetc(p); // warn: file position may be indeterminate after I/O error
+
+   fclose(p);
+ }
+
+**Limitations**
+
+The checker does not track the correspondence between integer file descriptors
+and ``FILE *`` pointers. Operations on standard streams like ``stdin`` are not
+treated specially and are therefore often not recognized (because these streams
+are usually not opened explicitly by the program, and are global variables).
+
 .. _osx-checkers:
 
 osx
@@ -3116,99 +3209,6 @@ Check for misuses of stream APIs. Check for misuses of stream APIs: ``fopen, fcl
    fclose(F); // warn: closing a previously closed file stream
  }
 
-.. _alpha-unix-Stream:
-
-alpha.unix.Stream (C)
-"""""""""""""""""""""
-Check C stream handling functions:
-``fopen, fdopen, freopen, tmpfile, fclose, fread, fwrite, fgetc, fgets, fputc, fputs, fprintf, fscanf, ungetc, getdelim, getline, fseek, fseeko, ftell, ftello, fflush, rewind, fgetpos, fsetpos, clearerr, feof, ferror, fileno``.
-
-The checker maintains information about the C stream objects (``FILE *``) and
-can detect error conditions related to use of streams. The following conditions
-are detected:
-
-* The ``FILE *`` pointer passed to the function is NULL (the single exception is
-  ``fflush`` where NULL is allowed).
-* Use of stream after close.
-* Opened stream is not closed.
-* Read from a stream after end-of-file. (This is not a fatal error but reported
-  by the checker. Stream remains in EOF state and the read operation fails.)
-* Use of stream when the file position is indeterminate after a previous failed
-  operation. Some functions (like ``ferror``, ``clearerr``, ``fseek``) are
-  allowed in this state.
-* Invalid 3rd ("``whence``") argument to ``fseek``.
-
-The stream operations are by this checker usually split into two cases, a success
-and a failure case. However, in the case of write operations (like ``fwrite``,
-``fprintf`` and even ``fsetpos``) this behavior could produce a large amount of
-unwanted reports on projects that don't have error checks around the write
-operations, so by default the checker assumes that write operations always succeed.
-This behavior can be controlled by the ``Pedantic`` flag: With
-``-analyzer-config alpha.unix.Stream:Pedantic=true`` the checker will model the
-cases where a write operation fails and report situations where this leads to
-erroneous behavior. (The default is ``Pedantic=false``, where write operations
-are assumed to succeed.)
-
-.. code-block:: c
-
- void test1() {
-   FILE *p = fopen("foo", "r");
- } // warn: opened file is never closed
-
- void test2() {
-   FILE *p = fopen("foo", "r");
-   fseek(p, 1, SEEK_SET); // warn: stream pointer might be NULL
-   fclose(p);
- }
-
- void test3() {
-   FILE *p = fopen("foo", "r");
-   if (p) {
-     fseek(p, 1, 3); // warn: third arg should be SEEK_SET, SEEK_END, or SEEK_CUR
-     fclose(p);
-   }
- }
-
- void test4() {
-   FILE *p = fopen("foo", "r");
-   if (!p)
-     return;
-
-   fclose(p);
-   fclose(p); // warn: stream already closed
- }
-
- void test5() {
-   FILE *p = fopen("foo", "r");
-   if (!p)
-     return;
-
-   fgetc(p);
-   if (!ferror(p))
-     fgetc(p); // warn: possible read after end-of-file
-
-   fclose(p);
- }
-
- void test6() {
-   FILE *p = fopen("foo", "r");
-   if (!p)
-     return;
-
-   fgetc(p);
-   if (!feof(p))
-     fgetc(p); // warn: file position may be indeterminate after I/O error
-
-   fclose(p);
- }
-
-**Limitations**
-
-The checker does not track the correspondence between integer file descriptors
-and ``FILE *`` pointers. Operations on standard streams like ``stdin`` are not
-treated specially and are therefore often not recognized (because these streams
-are usually not opened explicitly by the program, and are global variables).
-
 .. _alpha-unix-cstring-BufferOverlap:
 
 alpha.unix.cstring.BufferOverlap (C)

diff --git a/clang/include/clang/AST/ASTNodeTraverser.h b/clang/include/clang/AST/ASTNodeTraverser.h
@@ -844,6 +844,12 @@ class ASTNodeTraverser
     }
   }
 
+  void VisitUnresolvedLookupExpr(const UnresolvedLookupExpr *E) {
+    if (E->hasExplicitTemplateArgs())
+      for (auto Arg : E->template_arguments())
+        Visit(Arg.getArgument());
+  }
+
   void VisitRequiresExpr(const RequiresExpr *E) {
     for (auto *D : E->getLocalParameters())
       Visit(D);

diff --git a/clang/include/clang/AST/DeclContextInternals.h b/clang/include/clang/AST/DeclContextInternals.h
@@ -42,11 +42,12 @@ class StoredDeclsList {
   /// external declarations.
   DeclsAndHasExternalTy Data;
 
-  template<typename Fn>
-  void erase_if(Fn ShouldErase) {
+  template <typename Fn> DeclListNode::Decls *erase_if(Fn ShouldErase) {
     Decls List = Data.getPointer();
+
     if (!List)
-      return;
+      return nullptr;
+
     ASTContext &C = getASTContext();
     DeclListNode::Decls NewHead = nullptr;
     DeclListNode::Decls *NewLast = nullptr;
@@ -79,6 +80,17 @@ class StoredDeclsList {
     Data.setPointer(NewHead);
 
     assert(llvm::none_of(getLookupResult(), ShouldErase) && "Still exists!");
+
+    if (!Data.getPointer())
+      // All declarations are erased.
+      return nullptr;
+    else if (NewHead.is<NamedDecl *>())
+      // The list only contains a declaration, the header itself.
+      return (DeclListNode::Decls *)&Data;
+    else {
+      assert(NewLast && NewLast->is<NamedDecl *>() && "Not the tail?");
+      return NewLast;
+    }
   }
 
   void erase(NamedDecl *ND) {
@@ -160,12 +172,16 @@ class StoredDeclsList {
 
   void replaceExternalDecls(ArrayRef<NamedDecl*> Decls) {
     // Remove all declarations that are either external or are replaced with
-    // external declarations.
-    erase_if([Decls](NamedDecl *ND) {
+    // external declarations with higher visibilities.
+    DeclListNode::Decls *Tail = erase_if([Decls](NamedDecl *ND) {
       if (ND->isFromASTFile())
         return true;
+      // FIXME: Can we get rid of this loop completely?
       for (NamedDecl *D : Decls)
-        if (D->declarationReplaces(ND, /*IsKnownNewer=*/false))
+        // Only replace the local declaration if the external declaration has
+        // higher visibilities.
+        if (D->getModuleOwnershipKind() <= ND->getModuleOwnershipKind() &&
+            D->declarationReplaces(ND, /*IsKnownNewer=*/false))
           return true;
       return false;
     });
@@ -185,24 +201,15 @@ class StoredDeclsList {
       DeclsAsList = Node;
     }
 
-    DeclListNode::Decls Head = Data.getPointer();
-    if (Head.isNull()) {
+    if (!Data.getPointer()) {
       Data.setPointer(DeclsAsList);
       return;
     }
 
-    // Find the end of the existing list.
-    // FIXME: It would be possible to preserve information from erase_if to
-    // avoid this rescan looking for the end of the list.
-    DeclListNode::Decls *Tail = &Head;
-    while (DeclListNode *Node = Tail->dyn_cast<DeclListNode *>())
-      Tail = &Node->Rest;
-
     // Append the Decls.
     DeclListNode *Node = C.AllocateDeclListNode(Tail->get<NamedDecl *>());
     Node->Rest = DeclsAsList;
     *Tail = Node;
-    Data.setPointer(Head);
   }
 
   /// Return the list of all the decls.

diff --git a/clang/include/clang/AST/ExprCXX.h b/clang/include/clang/AST/ExprCXX.h
@@ -1482,6 +1482,8 @@ class CXXTemporary {
 ///     const S &s_ref = S(); // Requires a CXXBindTemporaryExpr.
 ///   }
 /// \endcode
+///
+/// Destructor might be null if destructor declaration is not valid.
 class CXXBindTemporaryExpr : public Expr {
   CXXTemporary *Temp = nullptr;
   Stmt *SubExpr = nullptr;

diff --git a/clang/include/clang/AST/NestedNameSpecifier.h b/clang/include/clang/AST/NestedNameSpecifier.h
@@ -266,7 +266,7 @@ class NestedNameSpecifierLoc {
   explicit operator bool() const { return Qualifier; }
 
   /// Evaluates true when this nested-name-specifier location is
-  /// empty.
+  /// non-empty.
   bool hasQualifier() const { return Qualifier; }
 
   /// Retrieve the nested-name-specifier to which this instance

diff --git a/clang/include/clang/AST/OpenACCClause.h b/clang/include/clang/AST/OpenACCClause.h
@@ -156,51 +156,50 @@ class OpenACCSelfClause : public OpenACCClauseWithCondition {
                                    Expr *ConditionExpr, SourceLocation EndLoc);
 };
 
-/// Represents a clause that has one or more IntExprs.  It does not own the
-/// IntExprs, but provides 'children' and other accessors.
-class OpenACCClauseWithIntExprs : public OpenACCClauseWithParams {
-  MutableArrayRef<Expr *> IntExprs;
+/// Represents a clause that has one or more expressions associated with it.
+class OpenACCClauseWithExprs : public OpenACCClauseWithParams {
+  MutableArrayRef<Expr *> Exprs;
 
 protected:
-  OpenACCClauseWithIntExprs(OpenACCClauseKind K, SourceLocation BeginLoc,
-                            SourceLocation LParenLoc, SourceLocation EndLoc)
+  OpenACCClauseWithExprs(OpenACCClauseKind K, SourceLocation BeginLoc,
+                         SourceLocation LParenLoc, SourceLocation EndLoc)
       : OpenACCClauseWithParams(K, BeginLoc, LParenLoc, EndLoc) {}
 
   /// Used only for initialization, the leaf class can initialize this to
   /// trailing storage.
-  void setIntExprs(MutableArrayRef<Expr *> NewIntExprs) {
-    assert(IntExprs.empty() && "Cannot change IntExprs list");
-    IntExprs = NewIntExprs;
+  void setExprs(MutableArrayRef<Expr *> NewExprs) {
+    assert(Exprs.empty() && "Cannot change Exprs list");
+    Exprs = NewExprs;
   }
 
-  /// Gets the entire list of integer expressions, but leave it to the
+  /// Gets the entire list of expressions, but leave it to the
   /// individual clauses to expose this how they'd like.
-  llvm::ArrayRef<Expr *> getIntExprs() const { return IntExprs; }
+  llvm::ArrayRef<Expr *> getExprs() const { return Exprs; }
 
 public:
   child_range children() {
-    return child_range(reinterpret_cast<Stmt **>(IntExprs.begin()),
-                       reinterpret_cast<Stmt **>(IntExprs.end()));
+    return child_range(reinterpret_cast<Stmt **>(Exprs.begin()),
+                       reinterpret_cast<Stmt **>(Exprs.end()));
   }
 
   const_child_range children() const {
     child_range Children =
-        const_cast<OpenACCClauseWithIntExprs *>(this)->children();
+        const_cast<OpenACCClauseWithExprs *>(this)->children();
     return const_child_range(Children.begin(), Children.end());
   }
 };
 
 class OpenACCNumGangsClause final
-    : public OpenACCClauseWithIntExprs,
+    : public OpenACCClauseWithExprs,
       public llvm::TrailingObjects<OpenACCNumGangsClause, Expr *> {
 
   OpenACCNumGangsClause(SourceLocation BeginLoc, SourceLocation LParenLoc,
                         ArrayRef<Expr *> IntExprs, SourceLocation EndLoc)
-      : OpenACCClauseWithIntExprs(OpenACCClauseKind::NumGangs, BeginLoc,
-                                  LParenLoc, EndLoc) {
+      : OpenACCClauseWithExprs(OpenACCClauseKind::NumGangs, BeginLoc, LParenLoc,
+                               EndLoc) {
     std::uninitialized_copy(IntExprs.begin(), IntExprs.end(),
                             getTrailingObjects<Expr *>());
-    setIntExprs(MutableArrayRef(getTrailingObjects<Expr *>(), IntExprs.size()));
+    setExprs(MutableArrayRef(getTrailingObjects<Expr *>(), IntExprs.size()));
   }
 
 public:
@@ -209,35 +208,35 @@ class OpenACCNumGangsClause final
          ArrayRef<Expr *> IntExprs, SourceLocation EndLoc);
 
   llvm::ArrayRef<Expr *> getIntExprs() {
-    return OpenACCClauseWithIntExprs::getIntExprs();
+    return OpenACCClauseWithExprs::getExprs();
   }
 
   llvm::ArrayRef<Expr *> getIntExprs() const {
-    return OpenACCClauseWithIntExprs::getIntExprs();
+    return OpenACCClauseWithExprs::getExprs();
   }
 };
 
 /// Represents one of a handful of clauses that have a single integer
 /// expression.
-class OpenACCClauseWithSingleIntExpr : public OpenACCClauseWithIntExprs {
+class OpenACCClauseWithSingleIntExpr : public OpenACCClauseWithExprs {
   Expr *IntExpr;
 
 protected:
   OpenACCClauseWithSingleIntExpr(OpenACCClauseKind K, SourceLocation BeginLoc,
                                  SourceLocation LParenLoc, Expr *IntExpr,
                                  SourceLocation EndLoc)
-      : OpenACCClauseWithIntExprs(K, BeginLoc, LParenLoc, EndLoc),
+      : OpenACCClauseWithExprs(K, BeginLoc, LParenLoc, EndLoc),
         IntExpr(IntExpr) {
-    setIntExprs(MutableArrayRef<Expr *>{&this->IntExpr, 1});
+    setExprs(MutableArrayRef<Expr *>{&this->IntExpr, 1});
   }
 
 public:
-  bool hasIntExpr() const { return !getIntExprs().empty(); }
+  bool hasIntExpr() const { return !getExprs().empty(); }
   const Expr *getIntExpr() const {
-    return hasIntExpr() ? getIntExprs()[0] : nullptr;
+    return hasIntExpr() ? getExprs()[0] : nullptr;
   }
 
-  Expr *getIntExpr() { return hasIntExpr() ? getIntExprs()[0] : nullptr; };
+  Expr *getIntExpr() { return hasIntExpr() ? getExprs()[0] : nullptr; };
 };
 
 class OpenACCNumWorkersClause : public OpenACCClauseWithSingleIntExpr {
@@ -261,6 +260,40 @@ class OpenACCVectorLengthClause : public OpenACCClauseWithSingleIntExpr {
          Expr *IntExpr, SourceLocation EndLoc);
 };
 
+/// Represents a clause with one or more 'var' objects, represented as an expr,
+/// as its arguments. Var-list is expected to be stored in trailing storage.
+/// For now, we're just storing the original expression in its entirety, unlike
+/// OMP which has to do a bunch of work to create a private.
+class OpenACCClauseWithVarList : public OpenACCClauseWithExprs {
+protected:
+  OpenACCClauseWithVarList(OpenACCClauseKind K, SourceLocation BeginLoc,
+                           SourceLocation LParenLoc, SourceLocation EndLoc)
+      : OpenACCClauseWithExprs(K, BeginLoc, LParenLoc, EndLoc) {}
+
+public:
+  ArrayRef<Expr *> getVarList() { return getExprs(); }
+  ArrayRef<Expr *> getVarList() const { return getExprs(); }
+};
+
+class OpenACCPrivateClause final
+    : public OpenACCClauseWithVarList,
+      public llvm::TrailingObjects<OpenACCPrivateClause, Expr *> {
+
+  OpenACCPrivateClause(SourceLocation BeginLoc, SourceLocation LParenLoc,
+                       ArrayRef<Expr *> VarList, SourceLocation EndLoc)
+      : OpenACCClauseWithVarList(OpenACCClauseKind::Private, BeginLoc,
+                                 LParenLoc, EndLoc) {
+    std::uninitialized_copy(VarList.begin(), VarList.end(),
+                            getTrailingObjects<Expr *>());
+    setExprs(MutableArrayRef(getTrailingObjects<Expr *>(), VarList.size()));
+  }
+
+public:
+  static OpenACCPrivateClause *
+  Create(const ASTContext &C, SourceLocation BeginLoc, SourceLocation LParenLoc,
+         ArrayRef<Expr *> VarList, SourceLocation EndLoc);
+};
+
 template <class Impl> class OpenACCClauseVisitor {
   Impl &getDerived() { return static_cast<Impl &>(*this); }
 
@@ -299,6 +332,9 @@ template <class Impl> class OpenACCClauseVisitor {
 class OpenACCClausePrinter final
     : public OpenACCClauseVisitor<OpenACCClausePrinter> {
   raw_ostream &OS;
+  const PrintingPolicy &Policy;
+
+  void printExpr(const Expr *E);
 
 public:
   void VisitClauseList(ArrayRef<const OpenACCClause *> List) {
@@ -309,7 +345,8 @@ class OpenACCClausePrinter final
         OS << ' ';
     }
   }
-  OpenACCClausePrinter(raw_ostream &OS) : OS(OS) {}
+  OpenACCClausePrinter(raw_ostream &OS, const PrintingPolicy &Policy)
+      : OS(OS), Policy(Policy) {}
 
 #define VISIT_CLAUSE(CLAUSE_NAME)                                              \
   void Visit##CLAUSE_NAME##Clause(const OpenACC##CLAUSE_NAME##Clause &Clause);

diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
@@ -480,7 +480,7 @@ class Qualifiers {
   }
   void removeCVRQualifiers(unsigned mask) {
     assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits");
-    Mask &= ~mask;
+    Mask &= ~static_cast<uint64_t>(mask);
   }
   void removeCVRQualifiers() {
     removeCVRQualifiers(CVRMask);
@@ -609,7 +609,7 @@ class Qualifiers {
   }
   void removeFastQualifiers(unsigned mask) {
     assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits");
-    Mask &= ~mask;
+    Mask &= ~static_cast<uint64_t>(mask);
   }
   void removeFastQualifiers() {
     removeFastQualifiers(FastMask);
@@ -2378,6 +2378,10 @@ class alignas(TypeAlignment) Type : public ExtQualsTypeCommonBase {
   /// 'riscv_rvv_vector_bits' type attribute as VectorType.
   QualType getRVVEltType(const ASTContext &Ctx) const;
 
+  /// Returns the representative type for the element of a sizeless vector
+  /// builtin type.
+  QualType getSizelessVectorEltType(const ASTContext &Ctx) const;
+
   /// Types are partitioned into 3 broad categories (C99 6.2.5p1):
   /// object types, function types, and incomplete types.
 

diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
@@ -592,6 +592,49 @@ class AttrSubjectMatcherAggregateRule<AttrSubject subject> {
 
 def SubjectMatcherForNamed : AttrSubjectMatcherAggregateRule<Named>;
 
+// Enumeration specifying what kind of behavior should be used for late
+// parsing of attributes.
+class LateAttrParseKind <int val> {
+  int Kind = val;
+}
+
+// Never late parsed
+def LateAttrParseNever : LateAttrParseKind<0>;
+
+// Standard late attribute parsing
+//
+// This is language dependent. For example:
+//
+// * For C++ enables late parsing of a declaration attributes
+// * For C does not enable late parsing of attributes
+//
+def LateAttrParseStandard : LateAttrParseKind<1>;
+
+// Experimental extension to standard late attribute parsing
+//
+// This extension behaves like `LateAttrParseStandard` but allows
+// late parsing attributes in more contexts.
+//
+// In contexts where `LateAttrParseStandard` attributes are late
+// parsed, `LateAttrParseExperimentalExt` attributes will also
+// be late parsed.
+//
+// In contexts that only late parse `LateAttrParseExperimentalExt` attributes
+// (see `LateParsedAttrList::lateAttrParseExperimentalExtOnly()`)
+//
+// * If `-fexperimental-late-parse-attributes`
+//   (`LangOpts.ExperimentalLateParseAttributes`) is enabled the attribute
+//   will be late parsed.
+// * If `-fexperimental-late-parse-attributes`
+//   (`LangOpts.ExperimentalLateParseAttributes`) is disabled the attribute
+//   will **not** be late parsed (i.e parsed immediately).
+//
+// The following contexts are supported:
+//
+// * TODO: Add contexts here when they are implemented.
+//
+def LateAttrParseExperimentalExt : LateAttrParseKind<2>;
+
 class Attr {
   // The various ways in which an attribute can be spelled in source
   list<Spelling> Spellings;
@@ -603,8 +646,8 @@ class Attr {
   list<Accessor> Accessors = [];
   // Specify targets for spellings.
   list<TargetSpecificSpelling> TargetSpecificSpellings = [];
-  // Set to true for attributes with arguments which require delayed parsing.
-  bit LateParsed = 0;
+  // Specifies the late parsing kind.
+  LateAttrParseKind LateParsed = LateAttrParseNever;
   // Set to false to prevent an attribute from being propagated from a template
   // to the instantiation.
   bit Clone = 1;
@@ -3173,7 +3216,7 @@ def DiagnoseIf : InheritableAttr {
               BoolArgument<"ArgDependent", 0, /*fake*/ 1>,
               DeclArgument<Named, "Parent", 0, /*fake*/ 1>];
   let InheritEvenIfAlreadyPresent = 1;
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let AdditionalMembers = [{
     bool isError() const { return diagnosticType == DT_Error; }
     bool isWarning() const { return diagnosticType == DT_Warning; }
@@ -3211,7 +3254,7 @@ def ObjCRequiresPropertyDefs : InheritableAttr {
 def Unused : InheritableAttr {
   let Spellings = [CXX11<"", "maybe_unused", 201603>, GCC<"unused">,
                    C23<"", "maybe_unused", 202106>];
-  let Subjects = SubjectList<[Var, ObjCIvar, Type, Enum, EnumConstant, Label,
+  let Subjects = SubjectList<[Var, Binding, ObjCIvar, Type, Enum, EnumConstant, Label,
                               Field, ObjCMethod, FunctionLike]>;
   let Documentation = [WarnMaybeUnusedDocs];
 }
@@ -3472,7 +3515,7 @@ def AssertCapability : InheritableAttr {
   let Spellings = [Clang<"assert_capability", 0>,
                    Clang<"assert_shared_capability", 0>];
   let Subjects = SubjectList<[Function]>;
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3488,7 +3531,7 @@ def AcquireCapability : InheritableAttr {
                    GNU<"exclusive_lock_function">,
                    GNU<"shared_lock_function">];
   let Subjects = SubjectList<[Function]>;
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3504,7 +3547,7 @@ def TryAcquireCapability : InheritableAttr {
                    Clang<"try_acquire_shared_capability", 0>];
   let Subjects = SubjectList<[Function],
                              ErrorDiag>;
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3520,7 +3563,7 @@ def ReleaseCapability : InheritableAttr {
                    Clang<"release_generic_capability", 0>,
                    Clang<"unlock_function", 0>];
   let Subjects = SubjectList<[Function]>;
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3539,7 +3582,7 @@ def RequiresCapability : InheritableAttr {
                    Clang<"requires_shared_capability", 0>,
                    Clang<"shared_locks_required", 0>];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3559,7 +3602,7 @@ def NoThreadSafetyAnalysis : InheritableAttr {
 def GuardedBy : InheritableAttr {
   let Spellings = [GNU<"guarded_by">];
   let Args = [ExprArgument<"Arg">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3570,7 +3613,7 @@ def GuardedBy : InheritableAttr {
 def PtGuardedBy : InheritableAttr {
   let Spellings = [GNU<"pt_guarded_by">];
   let Args = [ExprArgument<"Arg">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3581,7 +3624,7 @@ def PtGuardedBy : InheritableAttr {
 def AcquiredAfter : InheritableAttr {
   let Spellings = [GNU<"acquired_after">];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3592,7 +3635,7 @@ def AcquiredAfter : InheritableAttr {
 def AcquiredBefore : InheritableAttr {
   let Spellings = [GNU<"acquired_before">];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3603,7 +3646,7 @@ def AcquiredBefore : InheritableAttr {
 def AssertExclusiveLock : InheritableAttr {
   let Spellings = [GNU<"assert_exclusive_lock">];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3614,7 +3657,7 @@ def AssertExclusiveLock : InheritableAttr {
 def AssertSharedLock : InheritableAttr {
   let Spellings = [GNU<"assert_shared_lock">];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3627,7 +3670,7 @@ def AssertSharedLock : InheritableAttr {
 def ExclusiveTrylockFunction : InheritableAttr {
   let Spellings = [GNU<"exclusive_trylock_function">];
   let Args = [ExprArgument<"SuccessValue">, VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3640,7 +3683,7 @@ def ExclusiveTrylockFunction : InheritableAttr {
 def SharedTrylockFunction : InheritableAttr {
   let Spellings = [GNU<"shared_trylock_function">];
   let Args = [ExprArgument<"SuccessValue">, VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;
@@ -3651,7 +3694,7 @@ def SharedTrylockFunction : InheritableAttr {
 def LockReturned : InheritableAttr {
   let Spellings = [GNU<"lock_returned">];
   let Args = [ExprArgument<"Arg">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let Subjects = SubjectList<[Function]>;
@@ -3661,7 +3704,7 @@ def LockReturned : InheritableAttr {
 def LocksExcluded : InheritableAttr {
   let Spellings = [GNU<"locks_excluded">];
   let Args = [VariadicExprArgument<"Args">];
-  let LateParsed = 1;
+  let LateParsed = LateAttrParseStandard;
   let TemplateDependent = 1;
   let ParseArgumentsAsUnevaluated = 1;
   let InheritEvenIfAlreadyPresent = 1;

diff --git a/clang/include/clang/Basic/DiagnosticInstallAPIKinds.td b/clang/include/clang/Basic/DiagnosticInstallAPIKinds.td
@@ -24,7 +24,7 @@ def err_no_matching_target : Error<"no matching target found for target variant
 def err_unsupported_vendor : Error<"vendor '%0' is not supported: '%1'">;
 def err_unsupported_environment : Error<"environment '%0' is not supported: '%1'">;
 def err_unsupported_os : Error<"os '%0' is not supported: '%1'">;
-def err_cannot_read_alias_list : Error<"could not read alias list '%0': %1">;
+def err_cannot_read_input_list : Error<"could not read %select{alias list|filelist}0 '%1': %2">;
 } // end of command line category.
 
 let CategoryName = "Verification" in {

diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -478,6 +478,15 @@ def ext_decomp_decl_empty : ExtWarn<
   "ISO C++17 does not allow a decomposition group to be empty">,
   InGroup<DiagGroup<"empty-decomposition">>;
 
+// C++26 structured bindings
+def ext_decl_attrs_on_binding : ExtWarn<
+  "an attribute specifier sequence attached to a structured binding declaration "
+  "is a C++2c extension">, InGroup<CXX26>;
+def warn_cxx23_compat_decl_attrs_on_binding : Warning<
+  "an attribute specifier sequence attached to a structured binding declaration "
+  "is incompatible with C++ standards before C++2c">,
+  InGroup<CXXPre26Compat>, DefaultIgnore;
+
 /// Objective-C parser diagnostics
 def err_expected_minus_or_plus : Error<
   "method type specifier must start with '-' or '+'">;
@@ -1429,13 +1438,18 @@ def err_omp_decl_in_declare_simd_variant : Error<
 def err_omp_sink_and_source_iteration_not_allowd: Error<" '%0 %select{sink:|source:}1' must be with '%select{omp_cur_iteration - 1|omp_cur_iteration}1'">;
 def err_omp_unknown_map_type : Error<
   "incorrect map type, expected one of 'to', 'from', 'tofrom', 'alloc', 'release', or 'delete'">;
+def err_omp_more_one_map_type : Error<"map type is already specified">;
+def note_previous_map_type_specified_here
+    : Note<"map type '%0' is previous specified here">;
 def err_omp_unknown_map_type_modifier : Error<
   "incorrect map type modifier, expected one of: 'always', 'close', 'mapper'"
   "%select{|, 'present'|, 'present', 'iterator'}0%select{|, 'ompx_hold'}1">;
 def err_omp_map_type_missing : Error<
   "missing map type">;
 def err_omp_map_type_modifier_missing : Error<
   "missing map type modifier">;
+def err_omp_map_modifier_specification_list : Error<
+  "empty modifier-specification-list is not allowed">;
 def err_omp_declare_simd_inbranch_notinbranch : Error<
   "unexpected '%0' clause, '%1' is specified already">;
 def err_omp_expected_clause_argument

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -307,6 +307,8 @@ def err_invalid_vector_long_long_decl_spec : Error <
   "POWER7 or later) to be enabled">;
 def err_invalid_vector_long_double_decl_spec : Error<
   "cannot use 'long double' with '__vector'">;
+def err_invalid_vector_complex_decl_spec : Error<
+  "cannot use '_Complex' with '__vector'">;
 def warn_vector_long_decl_spec_combination : Warning<
   "Use of 'long' with '__vector' is deprecated">, InGroup<Deprecated>;
 
@@ -9901,6 +9903,9 @@ def warn_format_invalid_annotation : Warning<
 def warn_format_P_no_precision : Warning<
   "using '%%P' format specifier without precision">,
   InGroup<Format>;
+def warn_format_P_with_objc_pointer : Warning<
+  "using '%%P' format specifier with an Objective-C pointer results in dumping runtime object structure, not object value">,
+  InGroup<Format>;
 def warn_printf_ignored_flag: Warning<
   "flag '%0' is ignored when flag '%1' is present">,
   InGroup<Format>;
@@ -9950,6 +9955,8 @@ def warn_ret_stack_addr_ref : Warning<
 def warn_ret_local_temp_addr_ref : Warning<
   "returning %select{address of|reference to}0 local temporary object">,
   InGroup<ReturnStackAddress>;
+def err_ret_local_temp_ref : Error<
+  "returning reference to local temporary object">;
 def warn_ret_addr_label : Warning<
   "returning address of label, which is local">,
   InGroup<ReturnStackAddress>;
@@ -10328,9 +10335,13 @@ def err_shufflevector_nonconstant_argument : Error<
 def err_shufflevector_argument_too_large : Error<
   "index for __builtin_shufflevector must be less than the total number "
   "of vector elements">;
+def err_shufflevector_minus_one_is_undefined_behavior_constexpr : Error<
+  "index for __builtin_shufflevector not within the bounds of the input vectors; index of -1 found at position %0 not permitted in a constexpr context.">;
 
 def err_convertvector_non_vector : Error<
   "first argument to __builtin_convertvector must be a vector">;
+def err_convertvector_constexpr_unsupported_vector_cast : Error<
+  "unsupported vector cast from %0 to %1 in a constant expression.">;
 def err_builtin_non_vector_type : Error<
   "%0 argument to %1 must be of vector type">;
 def err_convertvector_incompatible_vector : Error<
@@ -12296,4 +12307,7 @@ def err_acc_num_gangs_num_args
             "OpenACC 'num_gangs' "
             "%select{|clause: '%1' directive expects maximum of %2, %3 were "
             "provided}0">;
+def err_acc_not_a_var_ref
+    : Error<"OpenACC variable is not a valid variable name, sub-array, array "
+            "element, or composite variable member">;
 } // end of sema component.
diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
@@ -164,6 +164,7 @@ LANGOPT(ExperimentalLibrary, 1, 0, "enable unstable and experimental library fea
 LANGOPT(PointerAuthIntrinsics, 1, 0, "pointer authentication intrinsics")
 
 LANGOPT(DoubleSquareBracketAttributes, 1, 0, "'[[]]' attributes extension for all language standard modes")
+LANGOPT(ExperimentalLateParseAttributes, 1, 0, "experimental late parsing of attributes")
 
 COMPATIBLE_LANGOPT(RecoveryAST, 1, 1, "Preserve expressions in AST when encountering errors")
 COMPATIBLE_LANGOPT(RecoveryASTType, 1, 1, "Preserve the type in recovery expressions")

diff --git a/clang/include/clang/Basic/OpenACCClauses.def b/clang/include/clang/Basic/OpenACCClauses.def
@@ -20,6 +20,7 @@ VISIT_CLAUSE(If)
 VISIT_CLAUSE(Self)
 VISIT_CLAUSE(NumGangs)
 VISIT_CLAUSE(NumWorkers)
+VISIT_CLAUSE(Private)
 VISIT_CLAUSE(VectorLength)
 
 #undef VISIT_CLAUSE
diff --git a/clang/include/clang/Basic/arm_neon.td b/clang/include/clang/Basic/arm_neon.td
@@ -275,7 +275,7 @@ def OP_VCVT_BF16_F32_HI_A32
                            (call "vget_low", $p0))>;
 
 def OP_CVT_F32_BF16
-    : Op<(bitcast "R", (op "<<", (bitcast "int32_t", $p0),
+    : Op<(bitcast "R", (op "<<", (cast "int32_t", (bitcast "int16_t", $p0)),
                                  (literal "int32_t", "16")))>;
 
 //===----------------------------------------------------------------------===//

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -603,7 +603,6 @@ class MarshallingInfoVisibility<KeyPathAndMacro kpm, code default>
 // Key paths that are constant during parsing of options with the same key path prefix.
 defvar cplusplus = LangOpts<"CPlusPlus">;
 defvar cpp11 = LangOpts<"CPlusPlus11">;
-defvar cpp14 = LangOpts<"CPlusPlus14">;
 defvar cpp17 = LangOpts<"CPlusPlus17">;
 defvar cpp20 = LangOpts<"CPlusPlus20">;
 defvar c99 = LangOpts<"C99">;
@@ -1609,6 +1608,13 @@ defm double_square_bracket_attributes : BoolFOption<"double-square-bracket-attri
   LangOpts<"DoubleSquareBracketAttributes">, DefaultTrue, PosFlag<SetTrue>,
  NegFlag<SetFalse>>;
 
+defm experimental_late_parse_attributes : BoolFOption<"experimental-late-parse-attributes",
+  LangOpts<"ExperimentalLateParseAttributes">, DefaultFalse,
+  PosFlag<SetTrue, [], [ClangOption], "Enable">,
+  NegFlag<SetFalse, [], [ClangOption], "Disable">,
+  BothFlags<[], [ClangOption, CC1Option],
+          " experimental late parsing of attributes">>;
+
 defm autolink : BoolFOption<"autolink",
   CodeGenOpts<"Autolink">, DefaultTrue,
   NegFlag<SetFalse, [], [ClangOption, CC1Option],
@@ -2887,6 +2893,17 @@ def flax_vector_conversions : Flag<["-"], "flax-vector-conversions">, Group<f_Gr
 def flimited_precision_EQ : Joined<["-"], "flimited-precision=">, Group<f_Group>;
 def fapple_link_rtlib : Flag<["-"], "fapple-link-rtlib">, Group<f_Group>,
   HelpText<"Force linking the clang builtins runtime library">;
+
+/// ClangIR-specific options - BEGIN
+defm clangir : BoolFOption<"clangir",
+  FrontendOpts<"UseClangIRPipeline">, DefaultFalse,
+  PosFlag<SetTrue, [], [ClangOption, CC1Option], "Use the ClangIR pipeline to compile">,
+  NegFlag<SetFalse, [], [ClangOption, CC1Option], "Use the AST -> LLVM pipeline to compile">,
+  BothFlags<[], [ClangOption, CC1Option], "">>;
+def emit_cir : Flag<["-"], "emit-cir">, Visibility<[CC1Option]>,
+  Group<Action_Group>, HelpText<"Build ASTs and then lower to ClangIR">;
+/// ClangIR-specific options - END
+
 def flto_EQ : Joined<["-"], "flto=">,
   Visibility<[ClangOption, CLOption, CC1Option, FC1Option, FlangOption]>,
   Group<f_Group>,
@@ -3371,9 +3388,10 @@ defm relaxed_template_template_args : BoolFOption<"relaxed-template-template-arg
           "Enable C++17 relaxed template template argument matching">,
   NegFlag<SetFalse>>;
 defm sized_deallocation : BoolFOption<"sized-deallocation",
-  LangOpts<"SizedDeallocation">, Default<cpp14.KeyPath>,
-  PosFlag<SetTrue, [], [], "Enable C++14 sized global deallocation functions">,
-  NegFlag<SetFalse>, BothFlags<[], [ClangOption, CC1Option]>>;
+  LangOpts<"SizedDeallocation">, DefaultFalse,
+  PosFlag<SetTrue, [], [ClangOption, CC1Option],
+          "Enable C++14 sized global deallocation functions">,
+  NegFlag<SetFalse>>;
 defm aligned_allocation : BoolFOption<"aligned-allocation",
   LangOpts<"AlignedAllocation">, Default<cpp17.KeyPath>,
   PosFlag<SetTrue, [], [ClangOption], "Enable C++17 aligned allocation functions">,
@@ -4881,6 +4899,8 @@ def msimd128 : Flag<["-"], "msimd128">, Group<m_wasm_Features_Group>;
 def mno_simd128 : Flag<["-"], "mno-simd128">, Group<m_wasm_Features_Group>;
 def mrelaxed_simd : Flag<["-"], "mrelaxed-simd">, Group<m_wasm_Features_Group>;
 def mno_relaxed_simd : Flag<["-"], "mno-relaxed-simd">, Group<m_wasm_Features_Group>;
+def mhalf_precision : Flag<["-"], "mhalf-precision">, Group<m_wasm_Features_Group>;
+def mno_half_precision : Flag<["-"], "mno-half-precision">, Group<m_wasm_Features_Group>;
 def mnontrapping_fptoint : Flag<["-"], "mnontrapping-fptoint">, Group<m_wasm_Features_Group>;
 def mno_nontrapping_fptoint : Flag<["-"], "mno-nontrapping-fptoint">, Group<m_wasm_Features_Group>;
 def msign_ext : Flag<["-"], "msign-ext">, Group<m_wasm_Features_Group>;
@@ -6587,12 +6607,6 @@ def J : JoinedOrSeparate<["-"], "J">,
   Group<gfortran_Group>,
   Alias<module_dir>;
 
-let Visibility = [FlangOption] in {
-def no_fortran_main : Flag<["-"], "fno-fortran-main">,
-  Visibility<[FlangOption]>, Group<f_Group>,
-  HelpText<"Do not include Fortran_main.a (provided by Flang) when linking">;
-} // let Visibility = [ FlangOption ]
-
 //===----------------------------------------------------------------------===//
 // FC1 Options
 //===----------------------------------------------------------------------===//

diff --git a/clang/include/clang/Frontend/FrontendOptions.h b/clang/include/clang/Frontend/FrontendOptions.h
@@ -65,6 +65,9 @@ enum ActionKind {
   /// Translate input source into HTML.
   EmitHTML,
 
+  /// Emit a .cir file
+  EmitCIR,
+
   /// Emit a .ll file.
   EmitLLVM,
 
@@ -408,6 +411,10 @@ class FrontendOptions {
   LLVM_PREFERRED_TYPE(bool)
   unsigned GenReducedBMI : 1;
 
+  /// Use Clang IR pipeline to emit code
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned UseClangIRPipeline : 1;
+
   CodeCompleteOptions CodeCompleteOpts;
 
   /// Specifies the output format of the AST.
@@ -590,7 +597,7 @@ class FrontendOptions {
         EmitSymbolGraph(false), EmitExtensionSymbolGraphs(false),
         EmitSymbolGraphSymbolLabelsForTesting(false),
         EmitPrettySymbolGraphs(false), GenReducedBMI(false),
-        TimeTraceGranularity(500) {}
+        UseClangIRPipeline(false), TimeTraceGranularity(500) {}
 
   /// getInputKindForExtension - Return the appropriate input kind for a file
   /// extension. For example, "c" would return Language::C.

diff --git a/clang/include/clang/InstallAPI/FileList.h b/clang/include/clang/InstallAPI/FileList.h
@@ -29,9 +29,10 @@ class FileListReader {
   ///
   /// \param InputBuffer JSON input data.
   /// \param Destination Container to load headers into.
+  /// \param FM Optional File Manager to validate input files exist.
   static llvm::Error
   loadHeaders(std::unique_ptr<llvm::MemoryBuffer> InputBuffer,
-              HeaderSeq &Destination);
+              HeaderSeq &Destination, clang::FileManager *FM = nullptr);
 
   FileListReader() = delete;
 };

diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
@@ -1398,12 +1398,21 @@ class Parser : public CodeCompletionHandler {
   // A list of late-parsed attributes.  Used by ParseGNUAttributes.
   class LateParsedAttrList: public SmallVector<LateParsedAttribute *, 2> {
   public:
-    LateParsedAttrList(bool PSoon = false) : ParseSoon(PSoon) { }
+    LateParsedAttrList(bool PSoon = false,
+                       bool LateAttrParseExperimentalExtOnly = false)
+        : ParseSoon(PSoon),
+          LateAttrParseExperimentalExtOnly(LateAttrParseExperimentalExtOnly) {}
 
     bool parseSoon() { return ParseSoon; }
+    /// returns true iff the attribute to be parsed should only be late parsed
+    /// if it is annotated with `LateAttrParseExperimentalExt`
+    bool lateAttrParseExperimentalExtOnly() {
+      return LateAttrParseExperimentalExtOnly;
+    }
 
   private:
-    bool ParseSoon;  // Are we planning to parse these shortly after creation?
+    bool ParseSoon; // Are we planning to parse these shortly after creation?
+    bool LateAttrParseExperimentalExtOnly;
   };
 
   /// Contains the lexed tokens of a member function definition
@@ -3645,11 +3654,12 @@ class Parser : public CodeCompletionHandler {
   ExprResult ParseOpenACCIDExpression();
   /// Parses the variable list for the `cache` construct.
   void ParseOpenACCCacheVarList();
+
+  using OpenACCVarParseResult = std::pair<ExprResult, OpenACCParseCanContinue>;
   /// Parses a single variable in a variable list for OpenACC.
-  bool ParseOpenACCVar();
-  /// Parses the variable list for the variety of clauses that take a var-list,
-  /// including the optional Special Token listed for some,based on clause type.
-  bool ParseOpenACCClauseVarList(OpenACCClauseKind Kind);
+  OpenACCVarParseResult ParseOpenACCVar();
+  /// Parses the variable list for the variety of places that take a var-list.
+  llvm::SmallVector<Expr *> ParseOpenACCVarList();
   /// Parses any parameters for an OpenACC Clause, including required/optional
   /// parens.
   OpenACCClauseParseResult

diff --git a/clang/include/clang/Sema/DeclSpec.h b/clang/include/clang/Sema/DeclSpec.h
@@ -36,6 +36,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
+#include <optional>
 
 namespace clang {
   class ASTContext;
@@ -1790,6 +1791,7 @@ class DecompositionDeclarator {
   struct Binding {
     IdentifierInfo *Name;
     SourceLocation NameLoc;
+    std::optional<ParsedAttributes> Attrs;
   };
 
 private:
@@ -1809,15 +1811,15 @@ class DecompositionDeclarator {
       : Bindings(nullptr), NumBindings(0), DeleteBindings(false) {}
   DecompositionDeclarator(const DecompositionDeclarator &G) = delete;
   DecompositionDeclarator &operator=(const DecompositionDeclarator &G) = delete;
-  ~DecompositionDeclarator() {
-    if (DeleteBindings)
-      delete[] Bindings;
-  }
+  ~DecompositionDeclarator() { clear(); }
 
   void clear() {
     LSquareLoc = RSquareLoc = SourceLocation();
     if (DeleteBindings)
       delete[] Bindings;
+    else
+      llvm::for_each(llvm::MutableArrayRef(Bindings, NumBindings),
+                     [](Binding &B) { B.Attrs.reset(); });
     Bindings = nullptr;
     NumBindings = 0;
     DeleteBindings = false;
@@ -2339,10 +2341,10 @@ class Declarator {
   }
 
   /// Set the decomposition bindings for this declarator.
-  void
-  setDecompositionBindings(SourceLocation LSquareLoc,
-                           ArrayRef<DecompositionDeclarator::Binding> Bindings,
-                           SourceLocation RSquareLoc);
+  void setDecompositionBindings(
+      SourceLocation LSquareLoc,
+      MutableArrayRef<DecompositionDeclarator::Binding> Bindings,
+      SourceLocation RSquareLoc);
 
   /// AddTypeInfo - Add a chunk to this declarator. Also extend the range to
   /// EndLoc, which should be the last token of the chunk.

diff --git a/clang/include/clang/Sema/Lookup.h b/clang/include/clang/Sema/Lookup.h
@@ -499,7 +499,9 @@ class LookupResult {
   /// Note that while no result was found in the current instantiation,
   /// there were dependent base classes that could not be searched.
   void setNotFoundInCurrentInstantiation() {
-    assert(ResultKind == NotFound && Decls.empty());
+    assert((ResultKind == NotFound ||
+            ResultKind == NotFoundInCurrentInstantiation) &&
+           Decls.empty());
     ResultKind = NotFoundInCurrentInstantiation;
   }
 

diff --git a/clang/include/clang/Sema/ParsedAttr.h b/clang/include/clang/Sema/ParsedAttr.h
@@ -948,6 +948,7 @@ class ParsedAttributes : public ParsedAttributesView {
   ParsedAttributes(AttributeFactory &factory) : pool(factory) {}
   ParsedAttributes(const ParsedAttributes &) = delete;
   ParsedAttributes &operator=(const ParsedAttributes &) = delete;
+  ParsedAttributes(ParsedAttributes &&G) = default;
 
   AttributePool &getPool() const { return pool; }
 

diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
@@ -4097,12 +4097,12 @@ class Sema final : public SemaBase {
                                    SmallVectorImpl<QualType> &Exceptions,
                                    FunctionProtoType::ExceptionSpecInfo &ESI);
 
-  /// Add an exception-specification to the given member function
-  /// (or member function template). The exception-specification was parsed
-  /// after the method itself was declared.
+  /// Add an exception-specification to the given member or friend function
+  /// (or function template). The exception-specification was parsed
+  /// after the function itself was declared.
   void actOnDelayedExceptionSpecification(
-      Decl *Method, ExceptionSpecificationType EST,
-      SourceRange SpecificationRange, ArrayRef<ParsedType> DynamicExceptions,
+      Decl *D, ExceptionSpecificationType EST, SourceRange SpecificationRange,
+      ArrayRef<ParsedType> DynamicExceptions,
       ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr);
 
   class InheritedConstructorInfo;
@@ -6978,12 +6978,6 @@ class Sema final : public SemaBase {
                                    SourceLocation TemplateKWLoc,
                                    UnqualifiedId &Member, Decl *ObjCImpDecl);
 
-  MemberExpr *BuildMemberExpr(
-      Expr *Base, bool IsArrow, SourceLocation OpLoc, const CXXScopeSpec *SS,
-      SourceLocation TemplateKWLoc, ValueDecl *Member, DeclAccessPair FoundDecl,
-      bool HadMultipleCandidates, const DeclarationNameInfo &MemberNameInfo,
-      QualType Ty, ExprValueKind VK, ExprObjectKind OK,
-      const TemplateArgumentListInfo *TemplateArgs = nullptr);
   MemberExpr *
   BuildMemberExpr(Expr *Base, bool IsArrow, SourceLocation OpLoc,
                   NestedNameSpecifierLoc NNS, SourceLocation TemplateKWLoc,
@@ -7472,7 +7466,7 @@ class Sema final : public SemaBase {
   bool LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
                            CXXScopeSpec &SS);
   bool LookupParsedName(LookupResult &R, Scope *S, CXXScopeSpec *SS,
-                        bool AllowBuiltinCreation = false,
+                        QualType ObjectType, bool AllowBuiltinCreation = false,
                         bool EnteringContext = false);
   ObjCProtocolDecl *LookupProtocol(
       IdentifierInfo *II, SourceLocation IdLoc,
@@ -8881,11 +8875,13 @@ class Sema final : public SemaBase {
     /// functions (but no function templates).
     FoundFunctions,
   };
-  bool LookupTemplateName(
-      LookupResult &R, Scope *S, CXXScopeSpec &SS, QualType ObjectType,
-      bool EnteringContext, bool &MemberOfUnknownSpecialization,
-      RequiredTemplateKind RequiredTemplate = SourceLocation(),
-      AssumedTemplateKind *ATK = nullptr, bool AllowTypoCorrection = true);
+
+  bool
+  LookupTemplateName(LookupResult &R, Scope *S, CXXScopeSpec &SS,
+                     QualType ObjectType, bool EnteringContext,
+                     RequiredTemplateKind RequiredTemplate = SourceLocation(),
+                     AssumedTemplateKind *ATK = nullptr,
+                     bool AllowTypoCorrection = true);
 
   TemplateNameKind isTemplateName(Scope *S, CXXScopeSpec &SS,
                                   bool hasTemplateKeyword,
@@ -9249,7 +9245,8 @@ class Sema final : public SemaBase {
   void NoteTemplateParameterLocation(const NamedDecl &Decl);
 
   ExprResult BuildExpressionFromDeclTemplateArgument(
-      const TemplateArgument &Arg, QualType ParamType, SourceLocation Loc);
+      const TemplateArgument &Arg, QualType ParamType, SourceLocation Loc,
+      NamedDecl *TemplateParam = nullptr);
   ExprResult
   BuildExpressionFromNonTypeTemplateArgument(const TemplateArgument &Arg,
                                              SourceLocation Loc);
@@ -9572,9 +9569,10 @@ class Sema final : public SemaBase {
 
   bool isSameOrCompatibleFunctionType(QualType Param, QualType Arg);
 
-  TemplateArgumentLoc getTrivialTemplateArgumentLoc(const TemplateArgument &Arg,
-                                                    QualType NTTPType,
-                                                    SourceLocation Loc);
+  TemplateArgumentLoc
+  getTrivialTemplateArgumentLoc(const TemplateArgument &Arg, QualType NTTPType,
+                                SourceLocation Loc,
+                                NamedDecl *TemplateParam = nullptr);
 
   /// Get a template argument mapping the given template parameter to itself,
   /// e.g. for X in \c template<int X>, this would return an expression template

diff --git a/clang/include/clang/Sema/SemaOpenACC.h b/clang/include/clang/Sema/SemaOpenACC.h
@@ -48,8 +48,12 @@ class SemaOpenACC : public SemaBase {
       SmallVector<Expr *> IntExprs;
     };
 
+    struct VarListDetails {
+      SmallVector<Expr *> VarList;
+    };
+
     std::variant<std::monostate, DefaultDetails, ConditionDetails,
-                 IntExprDetails>
+                 IntExprDetails, VarListDetails>
         Details = std::monostate{};
 
   public:
@@ -112,6 +116,16 @@ class SemaOpenACC : public SemaBase {
       return const_cast<OpenACCParsedClause *>(this)->getIntExprs();
     }
 
+    ArrayRef<Expr *> getVarList() {
+      assert(ClauseKind == OpenACCClauseKind::Private &&
+             "Parsed clause kind does not have a var-list");
+      return std::get<VarListDetails>(Details).VarList;
+    }
+
+    ArrayRef<Expr *> getVarList() const {
+      return const_cast<OpenACCParsedClause *>(this)->getVarList();
+    }
+
     void setLParenLoc(SourceLocation EndLoc) { LParenLoc = EndLoc; }
     void setEndLoc(SourceLocation EndLoc) { ClauseRange.setEnd(EndLoc); }
 
@@ -147,7 +161,19 @@ class SemaOpenACC : public SemaBase {
               ClauseKind == OpenACCClauseKind::NumWorkers ||
               ClauseKind == OpenACCClauseKind::VectorLength) &&
              "Parsed clause kind does not have a int exprs");
-      Details = IntExprDetails{IntExprs};
+      Details = IntExprDetails{std::move(IntExprs)};
+    }
+
+    void setVarListDetails(ArrayRef<Expr *> VarList) {
+      assert(ClauseKind == OpenACCClauseKind::Private &&
+             "Parsed clause kind does not have a var-list");
+      Details = VarListDetails{{VarList.begin(), VarList.end()}};
+    }
+
+    void setVarListDetails(llvm::SmallVector<Expr *> &&VarList) {
+      assert(ClauseKind == OpenACCClauseKind::Private &&
+             "Parsed clause kind does not have a var-list");
+      Details = VarListDetails{std::move(VarList)};
     }
   };
 
@@ -194,6 +220,10 @@ class SemaOpenACC : public SemaBase {
   ExprResult ActOnIntExpr(OpenACCDirectiveKind DK, OpenACCClauseKind CK,
                           SourceLocation Loc, Expr *IntExpr);
 
+  /// Called when encountering a 'var' for OpenACC, ensures it is actually a
+  /// declaration reference to a variable of the correct type.
+  ExprResult ActOnVar(Expr *VarExpr);
+
   /// Checks and creates an Array Section used in an OpenACC construct/clause.
   ExprResult ActOnArraySectionExpr(Expr *Base, SourceLocation LBLoc,
                                    Expr *LowerBound,

diff --git a/clang/include/clang/Serialization/ASTRecordReader.h b/clang/include/clang/Serialization/ASTRecordReader.h
@@ -269,6 +269,9 @@ class ASTRecordReader
   /// Read an OpenMP children, advancing Idx.
   void readOMPChildren(OMPChildren *Data);
 
+  /// Read a list of Exprs used for a var-list.
+  llvm::SmallVector<Expr *> readOpenACCVarList();
+
   /// Read an OpenACC clause, advancing Idx.
   OpenACCClause *readOpenACCClause();
 

diff --git a/clang/include/clang/Serialization/ASTRecordWriter.h b/clang/include/clang/Serialization/ASTRecordWriter.h
@@ -15,6 +15,7 @@
 #define LLVM_CLANG_SERIALIZATION_ASTRECORDWRITER_H
 
 #include "clang/AST/AbstractBasicWriter.h"
+#include "clang/AST/OpenACCClause.h"
 #include "clang/AST/OpenMPClause.h"
 #include "clang/Serialization/ASTWriter.h"
 #include "clang/Serialization/SourceLocationEncoding.h"
@@ -293,6 +294,8 @@ class ASTRecordWriter
   /// Writes data related to the OpenMP directives.
   void writeOMPChildren(OMPChildren *Data);
 
+  void writeOpenACCVarList(const OpenACCClauseWithVarList *C);
+
   /// Writes out a single OpenACC Clause.
   void writeOpenACCClause(const OpenACCClause *C);
 

diff --git a/clang/include/clang/Serialization/ASTWriter.h b/clang/include/clang/Serialization/ASTWriter.h
@@ -76,6 +76,10 @@ class StoredDeclsList;
 class SwitchCase;
 class Token;
 
+namespace SrcMgr {
+class FileInfo;
+} // namespace SrcMgr
+
 /// Writes an AST file containing the contents of a translation unit.
 ///
 /// The ASTWriter class produces a bitstream containing the serialized
@@ -490,6 +494,11 @@ class ASTWriter : public ASTDeserializationListener,
   /// during \c SourceManager serialization.
   void computeNonAffectingInputFiles();
 
+  /// Some affecting files can be included from files that are not affecting.
+  /// This function erases source locations pointing into such files.
+  SourceLocation getAffectingIncludeLoc(const SourceManager &SourceMgr,
+                                        const SrcMgr::FileInfo &File);
+
   /// Returns an adjusted \c FileID, accounting for any non-affecting input
   /// files.
   FileID getAdjustedFileID(FileID FID) const;
@@ -525,6 +534,7 @@ class ASTWriter : public ASTDeserializationListener,
 
   /// Calculate hash of the pcm content.
   std::pair<ASTFileSignature, ASTFileSignature> createSignature() const;
+  ASTFileSignature createSignatureForNamedModule() const;
 
   void WriteInputFiles(SourceManager &SourceMgr, HeaderSearchOptions &HSOpts);
   void WriteSourceManagerBlock(SourceManager &SourceMgr,
@@ -885,6 +895,8 @@ class ASTWriter : public ASTDeserializationListener,
 /// AST and semantic-analysis consumer that generates a
 /// precompiled header from the parsed source code.
 class PCHGenerator : public SemaConsumer {
+  void anchor() override;
+
   Preprocessor &PP;
   std::string OutputFile;
   std::string isysroot;
@@ -928,17 +940,34 @@ class PCHGenerator : public SemaConsumer {
   bool hasEmittedPCH() const { return Buffer->IsComplete; }
 };
 
-class ReducedBMIGenerator : public PCHGenerator {
+class CXX20ModulesGenerator : public PCHGenerator {
+  void anchor() override;
+
 protected:
   virtual Module *getEmittingModule(ASTContext &Ctx) override;
 
+  CXX20ModulesGenerator(Preprocessor &PP, InMemoryModuleCache &ModuleCache,
+                        StringRef OutputFile, bool GeneratingReducedBMI);
+
 public:
-  ReducedBMIGenerator(Preprocessor &PP, InMemoryModuleCache &ModuleCache,
-                      StringRef OutputFile);
+  CXX20ModulesGenerator(Preprocessor &PP, InMemoryModuleCache &ModuleCache,
+                        StringRef OutputFile)
+      : CXX20ModulesGenerator(PP, ModuleCache, OutputFile,
+                              /*GeneratingReducedBMI=*/false) {}
 
   void HandleTranslationUnit(ASTContext &Ctx) override;
 };
 
+class ReducedBMIGenerator : public CXX20ModulesGenerator {
+  void anchor() override;
+
+public:
+  ReducedBMIGenerator(Preprocessor &PP, InMemoryModuleCache &ModuleCache,
+                      StringRef OutputFile)
+      : CXX20ModulesGenerator(PP, ModuleCache, OutputFile,
+                              /*GeneratingReducedBMI=*/true) {}
+};
+
 /// If we can elide the definition of \param D in reduced BMI.
 ///
 /// Generally, we can elide the definition of a declaration if it won't affect

diff --git a/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td b/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
@@ -563,6 +563,20 @@ def MismatchedDeallocatorChecker : Checker<"MismatchedDeallocator">,
   Dependencies<[DynamicMemoryModeling]>,
   Documentation<HasDocumentation>;
 
+// This must appear before StdCLibraryFunctionsChecker because a dependency.
+def StreamChecker : Checker<"Stream">,
+  HelpText<"Check stream handling functions">,
+  WeakDependencies<[NonNullParamChecker]>,
+  CheckerOptions<[
+    CmdLineOption<Boolean,
+                  "Pedantic",
+                  "If false, assume that stream operations which are often not "
+                  "checked for error do not fail.",
+                  "false",
+                  InAlpha>
+  ]>,
+  Documentation<HasDocumentation>;
+
 def StdCLibraryFunctionsChecker : Checker<"StdCLibraryFunctions">,
   HelpText<"Check for invalid arguments of C standard library functions, "
            "and apply relations between arguments and return value">,
@@ -581,7 +595,7 @@ def StdCLibraryFunctionsChecker : Checker<"StdCLibraryFunctions">,
                   "true",
                   InAlpha>
   ]>,
-  WeakDependencies<[CallAndMessageChecker, NonNullParamChecker]>,
+  WeakDependencies<[CallAndMessageChecker, NonNullParamChecker, StreamChecker]>,
   Documentation<HasDocumentation>;
 
 def VforkChecker : Checker<"Vfork">,
@@ -601,20 +615,6 @@ def PthreadLockChecker : Checker<"PthreadLock">,
   Dependencies<[PthreadLockBase]>,
   Documentation<HasDocumentation>;
 
-def StreamChecker : Checker<"Stream">,
-  HelpText<"Check stream handling functions">,
-  WeakDependencies<[NonNullParamChecker]>,
-  CheckerOptions<[
-    CmdLineOption<Boolean,
-                  "Pedantic",
-                  "If false, assume that stream operations which are often not "
-                  "checked for error do not fail."
-                  "fail.",
-                  "false",
-                  InAlpha>
-  ]>,
-  Documentation<HasDocumentation>;
-
 def SimpleStreamChecker : Checker<"SimpleStream">,
   HelpText<"Check for misuses of stream APIs">,
   Documentation<HasDocumentation>;
@@ -1628,6 +1628,7 @@ def TaintTesterChecker : Checker<"TaintTest">,
 def StreamTesterChecker : Checker<"StreamTester">,
   HelpText<"Add test functions to StreamChecker for test and debugging "
            "purposes.">,
+  WeakDependencies<[StreamChecker]>,
   Documentation<NotDocumented>;
 
 def ErrnoTesterChecker : Checker<"ErrnoTest">,

diff --git a/clang/include/clang/Tooling/CommonOptionsParser.h b/clang/include/clang/Tooling/CommonOptionsParser.h
@@ -49,17 +49,22 @@ namespace tooling {
 /// using namespace clang::tooling;
 /// using namespace llvm;
 ///
-/// static cl::OptionCategory MyToolCategory("My tool options");
+/// static cl::OptionCategory MyToolCategory("my-tool options");
 /// static cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage);
 /// static cl::extrahelp MoreHelp("\nMore help text...\n");
-/// static cl::opt<bool> YourOwnOption(...);
-/// ...
 ///
 /// int main(int argc, const char **argv) {
-///   CommonOptionsParser OptionsParser(argc, argv, MyToolCategory);
+///   auto ExpectedParser =
+///       CommonOptionsParser::create(argc, argv, MyToolCategory);
+///   if (!ExpectedParser) {
+///     llvm::errs() << ExpectedParser.takeError();
+///     return 1;
+///   }
+///   CommonOptionsParser& OptionsParser = ExpectedParser.get();
 ///   ClangTool Tool(OptionsParser.getCompilations(),
 ///                  OptionsParser.getSourcePathList());
-///   return Tool.run(newFrontendActionFactory<SyntaxOnlyAction>().get());
+///   return Tool.run(
+///       newFrontendActionFactory<clang::SyntaxOnlyAction>().get());
 /// }
 /// \endcode
 class CommonOptionsParser {